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    Creamy Mushroom and Spinach Pasta with Caramelized Onions

    By Julia | Updated: Nov 15, 2019 | Published: Jun 02, 2018 | 186 Comments

    560.5K shares
    • Facebook2.8K
    Jump to Recipe Print SaveSaved!
    This post may contain affiliate links. For more information, please see our affiliate policy.

    Creamy mushroom spinach pasta with caramelized onions is smothered in Parmesan cream sauce.  This easy meatless dish tastes like the main course from an Italian restaurant.

    Spinach Mushroom Pasta

     

    Caramelized onions add so much needed flavor to this meatless pasta. I use long pasta, such as fettuccine noodles, which work perfectly with the long strands of caramelized onions.

    If you enjoy meatless pasta recipes with lots of flavor, be sure to check out this sun-dried tomato and mushroom pasta and vodka tomato sauce pasta.

    Spinach Mushroom Pasta

    What makes this mushroom spinach pasta special?

    • The recipe uses basic, easy-to-find ingredients. In fact, the recipe uses just a few ingredients.  Everything you use in this recipe can be found in most grocery stores.
    • Pasta with mushrooms and spinach can be quite bland. Not this one, though! Why? First, caramelized onions add incredible flavor dimension. Second, you smother everything in a cream sauce. This pasta is anything BUT bland.
    • I use shiitake mushrooms that provide rich, meaty flavor to the pasta.
    • You don't need meat for this meatless pasta dish. To reinforce my point #2, pasta with mushrooms and spinach could be bland and therefore require meat. But because of the cream sauce and the caramelized onions, you will feel that this is a complete meal that doesn't even need meat.

    Spinach Mushroom Pasta

    Using shiitake mushrooms in a pasta dish

    In this recipe, I use shiitake mushrooms. Why? Because they have a rich, meaty flavor that complements creamy pasta perfectly. Remember my point early on that this recipe doesn't need meat? Well, just try shiitake mushrooms and you'll see why.  Shiitake mushrooms provide thick, chewy, yet soft texture and add a "meaty" component to this spinach pasta.

    Although I love shiitake mushrooms in this pasta, you, of course, can substitute all kinds of other mushrooms for shiitake. If you can't find shiitake, use portobello mushrooms or cremini mushrooms - both of these will be excellent substitutions for shiitake.

    mushroom spinach pasta with caramelized onions on a white plate

    Substitutions

    • I use fettuccine noodles (wide long pasta). You can also use spaghetti, linguine, angel hair pasta. I do prefer to use long pasta in this recipe vs. short pasta, such as penne. Long pasta makes a better presentation with caramelized onions, spinach, and mushrooms.
    • To make this pasta gluten-free, use gluten-free fettuccine or any other type of long gluten-free pasta.  Gluten-free brown rice fettuccine will work great!
    • To make the cream sauce I use heavy cream + milk. You can totally substitute half and half for that (in the same amounts).
    • Don't have shiitake mushrooms? Use portobello or cremini mushrooms.  

    Creamy mushroom pasta with caramelized onions and spinach, pasta recipes, pasta dinners, vegetarian recipes, vegetarian pasta

    To top it all, this spinach and mushroom pasta turned out to be quite versatile, too. You could definitely eat this creamy pasta loaded with vegetables as a stand-alone, meatless dish. It also makes a surprisingly great side dish for a grilled steak, pork or chicken. In fact, this pasta recipe happens to combine all of my 4 favorite sides for steak in one: mushrooms, creamed spinach, caramelized onions, and creamy pasta with cheese.

    So, feel free to eat this pasta as a stand-alone meatless dinner or add a piece of grilled steak, pork, or chicken.

    How to make Creamy Mushroom Spinach Pasta with Caramelized Onions

    Here are some step-by-step photos illustrating how to make this pasta. Scroll all the way down for the complete recipe.

    1) First, caramelize onions for 30 minutes to reach a nice deep brown color.  (See:  how to caramelize onions) Deglaze with a small amount of balsamic vinegar.

    cooking caramelized onions

    2) Next, cook shiitake mushrooms (without stems) in 1 tablespoon of olive oil. You can use any type of mushrooms of small size.

    cooking mushrooms

    3) Then, add spinach to caramelized onions and mushrooms mixture, stir until spinach wilts.

    cooking mushrooms, onions, and adding spinach

    4) Next, add heavy cream, milk, Parmesan cheese and salt to the vegetable mixture.

    cooking mushrooms, caramelized onions, and spinach

    5) Add cooked and drained pasta and cook for 5-10 minutes on low heat so that creamy sauce coats pasta and Parmesan cheese melts and coats pasta as well.

    Tips for making pasta sauce super creamy

    Does your cream sauce clump as you're trying to make it? Or, does the sauce separate in the process? Here is how to avoid and fix all these problems:

    • Make sure your pan or skillet is very hot before you add the cream sauce ingredients. In this recipe, this is achieved by caramelizing the onions first, cooking the mushrooms, then wilting the spinach - all in the same skillet.  This ensures that the pan is already very well heated.
    • Bring heavy cream and milk to a boil just for a second.  Immediately, add shredded Parmesan cheese, make sure everything is boiling. Then, immediately reduce everything to simmer. The point in doing all this is again to make sure your cooking pan/skillet is hot enough to handle the sauce. The cheese simply will not melt properly if the ingredients are not hot enough. Bringing everything to a short boil and then reducing heat to simmer (low boiling, but still boiling point) ensures the melting of the cheese instead of clumping.
    • Keep stirring the sauce at all times. This ensures again that the sauce is smooth and has a consistent, even texture. Do not continue to boil the cream sauce. Bring everything to simmer immediately after reaching the boiling point as described above.
    • If your sauce is too thick after adding the cheese, thin out the sauce by slowly adding milk (or half-and-half) while simmering the sauce. Make sure the sauce continues to simmer and does not come to a standstill, while you add milk to thin it out.

    Creamy mushroom pasta with caramelized onions and spinach

    More delicious mushroom pasta recipes

    I love combining mushrooms and pasta:

    • If you want simplicity and you love garlic and butter, you'll love this super easy meatless garlic and mushroom pasta smothered in butter and shredded Parmesan.
    • If you want meat, such as chicken, and enjoy the more complex flavor, check out this chicken pesto pasta with mushrooms - it's so creamy and the basil pesto sauce combines beautifully with chicken, pasta, and mushrooms.
    • How about homemade vodka sauce with mushrooms?  And chicken?  Then definitely try one of my all-time favorites: penne pasta in creamy vodka tomato sauce with mushrooms.
    Spinach Mushroom Pasta
    4.72 from 46 votes

    Creamy Mushroom Spinach Pasta with Caramelized Onions

    This creamy pasta is loaded with spinach, mushrooms, caramelized onions, and then smothered in a creamy Parmesan cheese sauce.  This is a meatless pasta recipe that doesn't need any meat.  At the same time, it serves as an excellent side dish with grilled meats, such as steak, pork or chicken.  This mushroom spinach pasta is super versatile!  
    Print Recipe Pin Recipe Save RecipeSaved!
    Prep Time 20 minutes mins
    Cook Time 30 minutes mins
    Total Time 50 minutes mins
    Course Main Course
    Cuisine Italian
    Servings 4 people
    Calories per serving 588 kcal
    Author: Julia

    Ingredients

    • 1 tablespoon olive oil
    • 3 onions medium or large, sliced
    • ¼ teaspoon salt
    • 1 tablespoon balsamic vinegar
    • 1 tablespoon olive oil
    • 10 oz mushrooms , sliced (I used shiitake)
    • 6 oz spinach
    • 8 oz fettuccine
    • ⅔ cup heavy cream
    • ⅓ cup milk
    • 1 cup Parmesan cheese shredded
    • ¼ teaspoon salt
    Prevent your screen from going dark

    Instructions 

    How to caramelize onions:

    • Heat 1 tablespoon olive oil on high heat in a large skillet, when oil is heated, add sliced onions and cook on high heat for about 10 minutes, constantly stirring with spatula. The onions should start to brown, but without burning (a couple of onions may be burnt here and there, but overall they should not be charred). 
    • Reduce heat to medium and continue cooking onions for 10 more minutes, continuing to stir, as onions brown even more without burning. At this point add just a pinch of salt over onions. 
    • Continue cooking for 10 more minutes on medium or low heat, stirring occasionally to make sure onions don’t stick to the bottom of the pan or burn. Total you should have cooked onions for 30 minutes. 
    • Remove from heat and sprinkle onions with a small amount of balsamic vinegar to deglaze the pan. Using spatula, mix the onions, scraping the bottom of the pan and coating onions with a pinch of balsamic vinegar you just added.  Remove caramelized onions to a plate

    How to cook mushrooms and spinach:

    • Heat 1 tablespoon olive oil in the same skillet, and add sliced mushrooms (I used shiitake with stems removed, you can use any small sized mushrooms). Add just a pinch of salt. 
    • Reduce heat to medium-low and cook mushrooms covered for about 20 minutes, occasionally stirring. 
    • NOTE: if you use other mushrooms (not shiitake) the cooking time will be much shorter, only about 5 minutes. Shiitake mushrooms need longer times to cook. If you use regular button mushroom – cook them for only about 5 minutes until they soften.
    • Add caramelized onions back to the skillet with cooked mushrooms.   Add 3 cups of fresh spinach and stir on low heat just until spinach wilts.

    Cook pasta:

    • Cook pasta according to package instructions. Drain.

    Make cream sauce:

    • Add heavy cream and milk to he mushroom-onions-spinach mixture and bring to a quick boil.
    • Immediately add shredded Parmesan cheese and ¼ teaspoon salt and reduce heat to simmer (low boiling point).  Keep stirring to melt the cheese.  
    • Add cooked and drained pasta to the creamy sauce, stir to coat on low heat for about 5-10 minutes until Parmesan cheese melts completely and starts to coat pasta as well.
    • Serve on warm plates (warmed in the oven) as is, or with more parmesan cheese sprinkled on top.

    Nutrition

    Nutrition Information
    Creamy Mushroom Spinach Pasta with Caramelized Onions
    Amount per Serving
    Calories
    588
    % Daily Value*
    Fat
     
    31
    g
    48
    %
    Saturated Fat
     
    15
    g
    94
    %
    Cholesterol
     
    121
    mg
    40
    %
    Sodium
     
    768
    mg
    33
    %
    Potassium
     
    801
    mg
    23
    %
    Carbohydrates
     
    55
    g
    18
    %
    Fiber
     
    4
    g
    17
    %
    Sugar
     
    8
    g
    9
    %
    Protein
     
    22
    g
    44
    %
    Vitamin A
     
    4835
    IU
    97
    %
    Vitamin C
     
    19.8
    mg
    24
    %
    Calcium
     
    426
    mg
    43
    %
    Iron
     
    3
    mg
    17
    %
    * Percent Daily Values are based on a 2000 calorie diet.

    Nutrition Disclaimer:

    The nutritional information on this website is only an estimate and is provided for convenience and as a courtesy only. The accuracy of the nutritional information for any recipe on this site is not guaranteed. It should not be used as a substitute for a professional nutritionist’s advice.

    Keyword creamy pasta, meatless pasta, mushroom spinach pasta

    This recipe was originally published on January 22, 2013, and republished with updates, cooking tips in June 2018.

    « Italian Sausage Pasta with Vegetables
    Garlic Mushroom Pasta »
    560.5K shares
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      Recipe Rating




    1. NGT

      June 17, 2024 at 7:15 pm

      I added, pepper, garlic, and ground beef. I did have to add more heavy cream.

      Reply
      • Julia

        June 19, 2024 at 8:58 pm

        I love that you turned it into a more substantial meal by adding ground beef.

        Reply
    2. Carole

      September 01, 2022 at 7:32 am

      Highly recommend this recipe! The caramelized onions makes the dish! Loved it rave reviews - so versatile a keeper! Added cut up fresh asparagus to the spinach. I also put 2 handfuls of fresh spinach leaves in the bottom of the serving bowl, dumped the hot pasta dish on top and tossed sprinkled cut up Basil over top with extra cheese...YUMM Gave the dish texture and freshness.

      Reply
      • Julia

        September 01, 2022 at 4:06 pm

        Carole, thank you so much for your rave review - I really appreciate it! 🙂 And, I love how you served this - by adding fresh spinach to the bottom of the serving bowl and then adding hot pasta on top!

        Reply
    3. Brock

      March 13, 2022 at 9:48 pm

      Excellent recipe! Just made it the second time this evening and it was just as good as the last time. Used Asiago cheese instead of parmesan and it was a bit milder flavor. Delicious, and the sweetness of the onions just makes the dish!

      Reply
      • Julia

        March 21, 2022 at 10:47 pm

        Brock, I am so glad you tried this recipe and liked it! Asiago cheese adds amazing flavor!

        Reply
    4. Brandie

      March 13, 2022 at 7:58 pm

      This is one of our go to dishes for impressing company. I haven’t met a person who didn’t like it! It is so flavorful and can truly be served with anything, but we really enjoy serving it with quality led rare steaks!

      Reply
      • Julia

        March 21, 2022 at 10:51 pm

        Brandie, your comment made my day! 🙂 I am flattered to hear you serve this dish to impress company. Serving this with high-quality steaks takes this pasta to the next level!

        Reply
    5. Cecily

      March 06, 2022 at 5:46 pm

      This was absolutelly delicious and I'm thrilled to have leftovers. Great recipe, thanks!

      Reply
      • Cecily

        March 06, 2022 at 5:47 pm

        Absolutely.

        Reply
      • Julia

        March 22, 2022 at 12:12 am

        Cecily, I am glad you liked this pasta - thank you for the comment!!!

        Reply
      • Carlene

        April 20, 2023 at 7:12 pm

        Really enjoyed making this. Had fresh spinach from an organic farm nearby and wanted to make a fresh meal with it. I added no additional salt and used 3/4 Asiago and 1/4 Parmigiana cheese and baby bellas as this is what I had available. I really didn’t think the onions would cook down like they did. Omg, very pleased with the results. Will definitely make again!

        Reply
        • Julia

          June 07, 2023 at 10:00 pm

          Carlene, I am so glad this recipe exceed your expectations! Love that you used Asiago cheese - I love its stronger flavor!

          Reply
    6. Kem

      February 15, 2022 at 7:37 pm

      Made this last night and it was a huge hit! My entire house smelled like this dish! Lol

      Reply
      • Julia

        February 18, 2022 at 12:41 pm

        Kem, I am so happy the recipe was enjoyed! Thank you for taking the time to share such a wonderful comment!

        Reply
    7. Debi

      February 07, 2022 at 3:36 pm

      Absolutely delicious!! I crumbled some bacon in it and my husband raved about it. Shiitake mushrooms make this meal!!

      Reply
      • Julia

        February 11, 2022 at 7:08 pm

        Debi, I am so glad you've enjoyed this recipe! Thank you for the 5-star review!

        Reply
    8. Thks

      August 30, 2021 at 4:34 pm

      Thanks for the recipe! We really enjoyed it.

      Reply
    9. Denise

      August 19, 2020 at 7:38 pm

      Just made this tonight! It’s so delicious! Husband loved it too. We will keep this on rotation for dinners. Thank you!

      Reply
    10. Eve

      July 05, 2020 at 3:40 pm

      Made this dish already several times, each time great. Made it with 2/3 milk and 1/3 cup half and half and it was still delicious. Also made it with farfalle at another time. Great recipe. Thanks for sharing!

      Reply
      • Shirley Ens

        August 29, 2024 at 10:38 pm

        We were so excited to try your recipes as we love spinach and pasta. Unfortunately this
        was a disappointment. It was actually quite bland. We used Grana Padano cheese which we had on hand and have successfully substituted in many recipes without it affecting the flavor.
        Despite adding some chopped up chicken cooked in the air fryer with a spice blend rub, the flavor was lacking.
        We love leftovers, so hubby sautéed, 4 cloves of garlic, 2 chopped tomatoes and 1/2 c diced yellow and red peppers and added these.
        With these additions we really enjoyed this much more the second day.
        I would recommend adding extras or at minimum some spices if you make this.

        Reply
        • Julia

          September 03, 2024 at 2:52 am

          Thank you for your thoughtful feedback, Shirley, and for offering ways to add flavor to this dish - very helpful for everybody!

          My other suggestion is to use generous amounts of smoked paprika, Italian seasoning, and red pepper flakes. Or, you can use a whole (or half) of the small chicken bouillon cube to melt in the sauce to add flavor.

          Reply
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    Hi, I'm Julia!

    I am a full-time food blogger living in beautiful Colorado. I focus primarily on savory recipes (protein-based & fiber-rich main dishes, pasta, salads) using fresh & seasonal ingredients. A food blogger since 2012, I help home cooks create well-balanced and visually appealing dinners (many of which are 30-minute ONE-PAN meals). Find out more about me and my cooking philosophy. 

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