Sweet Potato Casserole with Pecan Topping

This post may contain affiliate links. Read my disclosure policy.

This homemade sweet potato casserole has a creamy, spiced filling made from roasted fresh sweet potatoes and a crunchy brown butter pecan streusel with toasted pecan halves. It's an easy, make-ahead Thanksgiving side dish that's perfect for any holiday table.

Why This Sweet Potato Casserole Is a Holiday Must-Make

Sweet potato casserole is one of those classic American sides that sits right on the line between side dish and dessert. I love it for exactly that reason. Here's why this version earned a permanent spot on my holiday menu (even though my list of Thanksgiving side dishes is already way too long):

• Roasted, Not Boiled: I roast whole sweet potatoes instead of boiling them. Roasting concentrates their natural sugars and keeps the filling thick and creamy, never watery.
• Brown Butter Pecan Streusel: Browning the butter gives the topping a toasty, nutty flavor that regular melted butter can't match. Add pecans two ways (chopped in the crumble and whole halves on top) and every bite has crunch.
• No Marshmallows Needed: The streusel is sweet enough to satisfy the marshmallow crowd, but it doesn't make the whole dish taste like candy.
• Make-Ahead Friendly: You can roast the sweet potatoes and mix the filling a day early. That frees up your oven when you need it most.
• Perfect for the holiday table: This casserole belongs on every Thanksgiving and Christmas menu. Serve it next to my honey brown sugar glazed ham, fan-favorite Brussels sprouts with bacon, pecans, and cranberries, fancy stuffed acorn squash with maple-cinnamon apples and pecans, and traditional garlic butter dinner rolls. 

Ingredients and Substitutions

This recipe has 2 components: the sweet potato filling and the brown butter pecan streusel, plus fresh herbs for garnish. For full amounts and recipe instructions, scroll down to the recipe card.

1) Sweet Potato Filling Ingredients

• Sweet potatoes: You'll need 4 pounds of fresh, whole sweet potatoes (weighed before roasting and peeling). Look for firm, medium-sized, orange-fleshed potatoes with smooth skins and no soft spots. They roast evenly and give the casserole its vibrant color.
• Heavy cream or whole milk: I recommend heavy cream for a richer, creamier filling. Whole milk works too, but the filling will be slightly less rich.
• Unsalted butter: Melted. If you only have salted butter, reduce the salt in the filling slightly.
• Light brown sugar: Packed. Dark brown sugar works too and gives a deeper molasses flavor.
• Vanilla extract: Vanilla bean paste is a great substitute.
• Ground cinnamon and nutmeg: Classic warm spices. You can swap both for 1 ¼ teaspoons of pumpkin pie spice.
• Fine salt: Balances the sweetness, so don't skip it.
• Large eggs: Lightly beaten. They help the filling set into soft, sliceable spoonfuls.

2) Brown Butter Pecan Streusel Ingredients

• Unsalted butter: Browned on the stovetop. I recommend unsalted so you can control the saltiness.
• All-purpose flour: Holds the streusel together into crumbs and clusters. For a gluten-free version, use a 1:1 gluten-free flour blend.
• Light brown sugar, cinnamon, and salt: Give the topping its sweet, warm flavor.
• Pecans: You'll need roughly chopped pecans for the streusel and pecan halves for the top. Walnuts are a good substitute if you prefer them.

3) For Garnishing

• Fresh thyme and sage: Optional, but they add a pretty, savory finish that makes the casserole look festive on a holiday table.

How to Make a Creamy Filling

• Roast, don't boil: Roasting brings out the sweetness without adding moisture, while boiling can make the filling watery. No need to peel or oil the potatoes. Just wash, dry, prick with a fork, and roast on a parchment-lined baking sheet (sticky juices are normal). Make sure they are completely tender, or the filling may turn out lumpy.
• Mash while warm: Use a potato masher, not a food processor, which can make the filling gummy. It should be thick, creamy, and spreadable, not runny.
• Cool before adding eggs: Let the mixture cool slightly first, so the eggs don't start cooking.
• Adjust the sweetness: Most of the sweetness comes from the streusel. If your sweet potatoes are very sweet, you can reduce the brown sugar in the filling slightly.

How to Make Brown Butter Pecan Streusel

• Brown the butter: Use a light-colored saucepan so you can see the color change. The butter will melt, bubble, and foam. Once it smells nutty and the bottom has golden-brown flecks, remove it from the heat right away. Scrape all the brown bits into the bowl, since they hold most of the flavor.
• Cool, then mix gently: Let the butter cool before adding it, or the topping will be too soft to form clusters. Don't overmix. Press some of the moist crumbs together with your fingers to make a mix of small and large clusters. If the topping is too soft, refrigerate it for 10 to 15 minutes.
• Protect the pecans: Pecans turn bitter if overbaked. The chopped pecans are protected inside the streusel. I add some pecan halves at the start and the rest during the last 10 to 15 minutes. If the top browns too quickly, loosely cover it with foil.

Baking, Serving & Making Ahead

• Baking dish: I recommend a 9 x 13-inch dish. A similar-sized dish works, but a deeper one may need more time and a shallower one less. Always check the center rather than relying on time alone.
• How to tell it's done: The streusel should be golden brown and lightly crisp, and the filling should be set. If the top is done before the center is hot, cover loosely with foil and keep baking. Let it rest 10 to 15 minutes before serving so it's easier to scoop.
• Garnish: Add fresh herbs just before serving for a pop of color and fresh-looking leaves.
• Make ahead: Prepare the filling up to a day ahead, spread it in the greased dish, cool, cover, and refrigerate. On baking day, take it out of the fridge while you make the streusel (fresh streusel stays crumbly). Bake 40 to 50 minutes, or until the center reaches 165°F (74°C).

How to Make Sweet Potato Casserole (Step-by-Step Photos)

This is a recipe overview. Scroll up for the complete instructions and ingredient amounts in the sweet potato casserole recipe card above.

• Roast the sweet potatoes: Prick the sweet potatoes with a fork and roast them on a baking sheet at 400°F (200°C) for 50 to 75 minutes, until a knife slides through easily. Some syrupy juices may leak onto the pan. That's a good sign!

• Scoop and mash: Once cool enough to handle, scoop the flesh into a large bowl and mash until no large pieces remain.

• Make the filling: Stir in the melted butter and brown sugar, then the cream, vanilla, spices, and salt. Let it cool slightly, then mix in the eggs.
• Fill the dish: Spread the filling into a greased 9x13-inch baking dish.

• Brown the butter: Cook the butter in a light-colored saucepan over medium heat until the milk solids turn golden brown and it smells nutty. Pour it into a bowl and let it cool for about 10 minutes.

• Make the streusel: Stir the brown butter into the flour, brown sugar, cinnamon, salt, and chopped pecans. Squeeze some together with your fingertips to form clusters.

• Top and bake. Lower the oven to 350°F (175°C). Scatter the streusel over the filling and press in half of the pecan halves. Bake for 30 to 40 minutes, tenting with foil if the top browns too fast.
• Add the last pecans. Scatter the remaining pecan halves over the top for the final 10 to 15 minutes so they toast without burning.
• Rest and serve. Let it rest for 10 to 15 minutes, then garnish with fresh thyme and sage. Serve warm.

FAQs

1. Can I make sweet potato casserole ahead of time? Yes! Prepare the filling, spread it in the baking dish, cover, and refrigerate it for up to 1 day. Make the streusel and keep it in a separate covered container in the fridge. Let the filling sit at room temperature for about 30 minutes, add the topping, and bake. It may need an extra 5 to 10 minutes in the oven.
2. Can I use canned sweet potatoes? I recommend fresh sweet potatoes for the best flavor and texture. Canned sweet potatoes (yams) are often packed in syrup and can make the filling too sweet and watery. If you need a shortcut, use about 6 cups of drained, mashed canned sweet potatoes and reduce the brown sugar.
3. Can I add marshmallows? Yes! If your family loves them, scatter mini marshmallows over part of the casserole during the last 5 to 10 minutes of baking and watch closely so they don't burn.
4. Why did my brown butter burn? Butter can go from browned to burnt very quickly. Use a light-colored saucepan so you can see the milk solids change color, swirl the pan often, and pull it off the heat as soon as the bits at the bottom turn golden brown and the butter smells nutty.
5. Do I bake it covered or uncovered? Bake it uncovered so the streusel gets golden and crisp. Check it after 20 to 25 minutes. If the topping is browning too quickly, lay a piece of foil loosely over the dish.

More Thanksgiving Side Dishes

• Roasted Brussels Sprouts and Cinnamon Butternut Squash with Pecans and Cranberries
• Brussels Sprouts with Bacon, Pecans, and Cranberries
• Green Beans with Pine Nuts
• Apple Stuffed Acorn Squash
• Easy Scalloped Potatoes with Garlic, Thyme, and Parmesan
• Sweet Potato Kale Salad with Maple-Candied Pecans
• Holiday Cheese Ball with Cranberries and Pecans
• 60 Thanksgiving Side Dishes That Will Outshine the Turkey