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    Creamy Mushroom and Spinach Pasta with Caramelized Onions

    Published: Jun 02, 2018 / 180 Comments

    560.5K shares
    • Facebook2.8K
    Recipe Print

    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
    4.87 from 36 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
    Prep Time 20 mins
    Cook Time 30 mins
    Total Time 50 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

    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.

    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
    Tried this recipe?Be sure to leave a comment and provide a Star Rating below - I love your feedback and try to respond to every comment!

    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 »
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    Please share your comment and Star Rating in the comments section below.

    I appreciate your feedback!

    Reader Interactions

    Comments

    1. Amanda Lyons

      January 06, 2020 at 3:06 pm

      HAs anyone tried substituting the pasta with spaghetti squash?

      Reply
      • Julia

        February 19, 2020 at 10:55 pm

        I think using spaghetti squash instead of regular pasta is an excellent substitution!

        Reply
    2. Megan

      October 11, 2019 at 8:42 pm

      Hello-this is a delicious recipe but not a quick one! I have made this a few times. In each case enough time passes that I forget that this recipe takes a while to make. Next time I will do the onions the day before to cut down the cooking time by at least 30 mins.

      Reply
      • Julia

        October 31, 2019 at 3:23 pm

        Yes, caramelizing the onions does take time. It's a good idea to prepare the onions the day before.

        Reply
    3. Leigh Ann Flickinger

      July 01, 2019 at 4:03 pm

      Top notch and not that hard to make - would highly recommend for an upscale family dinner and absolutely for entertaining - gourmet taste and beautiful presentation. I used 2 red onions and one Vidalia and portobello mushrooms instead of shitake. Great recipe!! Thanks Julia!! xoxo

      Reply
      • Julia

        July 22, 2019 at 2:46 pm

        You are very welcome! Thank you for such a wonderful comment! Using red onions and portobello mushrooms sounds delicious!

        Reply
    4. Jo Ann

      May 12, 2019 at 6:38 pm

      How would this work with arugula instead of spinach or kale? Has anyone tried it?

      Reply
      • Julia

        June 03, 2019 at 2:30 pm

        This recipe will work great with arugula!

        Reply
    5. Lori

      February 25, 2019 at 5:56 pm

      Can you use kale instead of spinach? And if so what do you reccomend for the cooking time

      Reply
      • Julia

        March 03, 2019 at 11:40 pm

        You can use kale! If you want tender kale, I would boil chopped kale in a separate pot of boiling water for about 4 minutes. Then, drain it, and add it to the recipe.

        Reply
    6. Kate

      July 15, 2018 at 5:17 pm

      We made this and it was delicious plus. The carmalized onions were so yummy all on their own. We will make this again.

      Reply
      • Julia

        July 16, 2018 at 11:27 am

        So glad you enjoyed the recipe! 🙂

        Reply
    7. Alyssa

      September 03, 2017 at 4:16 pm

      It doesn't say what kind of onions?

      Reply
      • Julia

        November 02, 2017 at 4:30 pm

        Just regular white or yellow onions.

        Reply
    8. Chelsea

      January 10, 2017 at 4:47 pm

      Hi there, I've made this recipe a few times before and it's just awesome! I want to make it for my boyfriend but he doesn't like onions... is there something else that I can substitute it for or do you think it would still be a good dish without the onions? Let me know 🙂

      Reply
      • Julia

        January 31, 2017 at 12:54 pm

        Thank you, Chelsea, I am glad you've enjoyed this recipe. If your boyfriend doesn't like onions, just omit them altogether, it will still be a nice dish! Maybe add extra mushrooms.

        Reply
      • Tammi

        June 03, 2018 at 6:30 pm

        Carmelized onions have a very different taste then regular onions......I'm not a big onion person either....I'm getting so I like green onions in things.

        Reply
        • Julia

          July 17, 2018 at 5:29 am

          Good point! Caramelized onions taste so different than regular onions - if someone does not normally like raw onions, they might try caramelized onions and see if they like them.

          Reply
    9. Loganski

      January 08, 2017 at 5:23 pm

      Well here we are almost 4 years to the day you posted this recipe and I've just made it for my family. We are all in heaven! Thanks so much. This will be made many more times.

      Reply
      • Julia

        January 31, 2017 at 1:17 pm

        Thank you! So glad your family liked this recipe. Yes, 4 years is a long time, I can't believe it's been that long since I posted this. Time flies! 🙁

        Reply
    10. Loganski

      January 08, 2017 at 5:19 pm

      Julia, I couldn't help but comment on this recipe. Here we are almost 4 years to the date you first posted and I've just discovered it and made it and the family, and myself, are absolutely in heaven. Thank you so much! Definitely will make this again and again.

      Reply
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