By

Wendy Stoltz,

Florina Dobre / Last Modified On March 31, 2026

This gluten-free sweet potato casserole is the Thanksgiving side dish that fools everyone at the table. The filling is a smooth, spiced sweet potato mash topped with a buttery pecan crumble that bakes up golden and crisp in just 30 minutes. I've served this to guests who have no idea it's gluten-free, and not one person has ever noticed a difference.

The best part: you can make the sweet potato filling up to 3 days ahead. On Thanksgiving Day, you add the topping and bake. That's it. No last-minute mashing, no juggling stovetop and oven at the same time.

Why This Recipe Works

The filling uses two eggs, which is the key to avoiding that dreaded watery casserole. Eggs bind the sweet potato mixture into a custard-style filling that holds its shape when you serve it. Skip the eggs and you'll end up with a runny mess. Don't skip the eggs.

For the topping, brown sugar is non-negotiable. White sugar won't give you that caramel-like depth. And the topping goes on right before baking, which is exactly why the make-ahead method works so well.

Ingredients and Substitutions

For the sweet potato filling:

• Sweet potatoes: 3 to 4 large, about 2 lbs. Fresh sweet potatoes give you the best texture and flavor. Canned works in a pinch but the filling will be wetter.
• Eggs: 2 large eggs. These are not optional. They bind the filling so it doesn't run.
• Milk: Whole milk. You can substitute cream for an even richer filling.
• Sugar: White sugar for sweetness in the filling.
• Butter: Unsalted, melted. We add salt separately.
• Vanilla extract: Use a good quality one. It makes a noticeable difference here.
• Spices: Cinnamon and allspice carry the warm fall flavor. Nutmeg deepens it. The allspice is what separates a great casserole from a bland one.

For the pecan crumble topping:

• Brown sugar: Dark brown sugar gives the most caramel-like richness. Light brown works too.
• Gluten-free all-purpose flour blend: See the flour comparison below for which blend produces the crispiest topping.
• Butter: Softened, not melted. Softened butter creates a better crumble texture.
• Pecans: Roughly chopped. Bigger chunks give better crunch.

Which gluten-free flour works best for the topping?

Not all blends perform the same in a crumble. Here's what to expect:

• Bob's Red Mill 1-to-1 Baking Flour: My first choice. Produces a crisp, golden topping that holds together well.
• King Arthur Measure for Measure: Also excellent. Very similar results to Bob's Red Mill.
• Cup4Cup: Works, but the topping can be slightly softer due to the higher moisture content of this blend.
• Almond flour: Creates a different texture, denser and richer. Good if you prefer a nutty topping throughout.

How to make this dairy-free:

• Milk: Substitute with unsweetened almond milk, soy milk, or full-fat canned coconut milk. Coconut milk gives the creamiest result.
• Butter: Use Earth Balance butter sticks or Miyoko's. Use the stick versions, not the spread. Spread versions have too much water content and can make both the filling and the topping soggy.

Equipment You'll Need

• Baking dish: A 9x13-inch baking dish. Light-colored ceramic or glass pans work better than dark metal here. Dark pans can over-brown the topping before the filling is fully set.
• Large pot or steamer: To cook the potatoes until fork-tender.
• Mixing bowls: One large for the filling, one medium for the topping.
• Potato masher: Essential for the right filling texture. A hand mixer also works if you prefer a smoother result.

How to Make Gluten-Free Sweet Potato Casserole

1. Boil the potatoes: Place cubed sweet potatoes in a large pot and cover with water by at least 2 to 3 inches. Boil until fork-tender, about 10 minutes. Drain and let cool for 10 minutes before mashing.
2. Mash the filling: Transfer the cooked sweet potato flesh to a large bowl. Add eggs, milk, melted butter, sugar, vanilla, spices, and salt. Mash until smooth. Let the potatoes cool slightly before adding the eggs so they don't scramble.
3. Make the topping: In a medium bowl, combine brown sugar, gluten-free flour, softened butter, and pecans. Stir until the pecans are coated and the mixture looks like a rough crumble.
4. Preheat the oven to 375°F.
5. Assemble: Spread the sweet potato filling into a 9x13-inch baking dish and smooth the top.
6. Add the topping: Sprinkle the pecan crumble evenly over the filling.
7. Bake: Bake for 25 to 30 minutes until the topping is crisp and golden brown.
8. Cool slightly before serving. The filling sets up better after a 10-minute rest.

Alternate methods for cooking the sweet potatoes:

• Instant Pot: Peel and cube potatoes. Add to pot with 1 cup water. Cook on High Pressure for 12 to 15 minutes. Quick release.
• Roasting: Preheat oven to 400°F. Pierce whole potatoes with a fork. Bake on a sheet pan for 45 to 60 minutes. Cool, peel, and mash.
• Steaming: Steam cubed potatoes over boiling water for 12 to 15 minutes. This keeps the most moisture out of the flesh, which can help with filling texture.

How to Make This Ahead

Make the sweet potato filling and spread it in the baking dish. Cover tightly with plastic wrap and refrigerate for up to 3 days. Keep the topping ingredients separate and unassembled. On the day of serving, mix the topping, sprinkle it over the cold filling, and bake. You may need to add 5 extra minutes to the bake time if the filling is coming straight from the fridge.

Variations

Marshmallow topping

Add a layer of mini marshmallows on top of the pecan crumble during the last 5 minutes of baking. Watch it closely. Marshmallows go from perfect to burnt fast.

Vegan sweet potato casserole

Replace the eggs with 2 tablespoons of ground flaxseed mixed with 6 tablespoons of water (let it sit for 5 minutes to gel). Use dairy-free butter sticks and unsweetened almond or coconut milk. The texture will be slightly less firm but still holds up well.

Nut-free version

Skip the pecans entirely and substitute gluten-free rolled oats, crushed gluten-free pretzels, or just the brown sugar and flour crumble without any added crunch. The topping still bakes up nicely without nuts.

Lower sugar version

Reduce the sugar in the filling by half. The topping is sweet enough to carry the dish. This works well if you're serving guests who find the traditional version too sweet.

Tips for Success

• Use fresh sweet potatoes. Canned potatoes have more moisture, which can make the filling runny even with eggs.
• Don't skip the eggs. They're what turns the filling from mashed sweet potatoes into a custard-style base that holds together.
• Let the potatoes cool before adding eggs. Hot potatoes scramble eggs. Give them 10 minutes after draining.
• Use softened butter in the topping, not melted. Melted butter makes the crumble wet. Softened butter creates the right crumbly texture.
• Fully preheat the oven. The topping needs a fully hot oven to crisp properly. Don't rush it in.

Serving Suggestions

This casserole is the anchor of any gluten-free Thanksgiving spread. Round out the table with gluten-free stuffing, gluten-free cornbread stuffing, and our 5-minute gluten-free gravy. For dessert, try this gluten-free sweet potato pie or browse the full gluten-free Thanksgiving desserts roundup.

Continue to Content

Yield: 8 servings

Gluten-Free Sweet Potato Casserole

Print

You don't need to miss your all-time favorite Thanksgiving side with this gluten-free sweet potato casserole recipe.

Prep Time 30 minutes

Cook Time 30 minutes

Total Time 1 hour

Ingredients

For the filling:

• 3-4 large, sweet potatoes, peeled and cubed (roughly 2lbs)
• 2 large eggs, beaten
• ½ cup whole milk
• ½ cup sugar
• ¼ cup melted butter
• 1 teaspoon vanilla extract
• 1 teaspoon cinnamon
• ½ teaspoon allspice or ground nutmeg
• ½ teaspoon salt

For the topping:

• ½ cup packed brown sugar
• ½ cup all-purpose gluten-free flour
• 4 tablespoons butter, softened
• ¾ cup roughly chopped pecans

Instructions

1. Place cubed sweet potatoes in a large pot and add enough water to cover by at least 2-3 inches.
2. Boil until the sweet potatoes are fork tender for about 10 minutes. Drain and let them cool for 10 minutes.
3. Transfer the sweet potatoes to a large bowl. Add eggs, milk, melted butter, sugar, vanilla, spices, and salt and mash until smooth. Add the mashed sweet potato to a 9x13 inches baking dish and smooth the surface with a spoon.
   
4. Preheat the oven to 375º
5. Combine brown sugar, flour, softened butter, and pecans in a medium bowl. Stir until the pecans are well coated and the ingredients are evenly distributed.
6. Sprinkle the mixture over the sweet potato mash
7. Bake for 25-30 minutes until the top is crispy.

Notes

• We used whole milk in this recipe but if you are dairy-free you can substitute it with any milk of choice like soy milk, almond milk, coconut milk, etc. Instead of butter use dairy-free butter or the same amount of coconut oil.
• If the sweet potato mash mixture is too thick you can add additional milk until desired consistency.
• You can assemble the ingredients ahead of time. You can make the sweet potato mash and put it in the baking dish, then mix up the pecan topping right before you bake it and want to serve it.
• You can also bake the sweet potatoes, but you might need to decrease the milk by half due to the water content while boiling the sweet potatoes. You can taste and adjust accordingly how thick or thin you want the mash to be.

Recommended Products

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• 
  Covered Sauce Pan
• 
  Pyrex Smart Essentials 3-Piece Prepware Mixing Bowl Set
• 
  KitchenAid Gourmet Stainless Steel Wire Masher, 10.24-Inch, Black
• 
  LEETOYI Ceramic 2.8 Quart Baking Dish, 9" x 13",Casserole Dish (White, Set of 2)

Nutrition Information:

Yield:

8

Serving Size:

1
Amount Per Serving: Calories: 376Total Fat: 21gSaturated Fat: 9gTrans Fat: 0gUnsaturated Fat: 11gCholesterol: 79mgSodium: 284mgCarbohydrates: 45gFiber: 4gSugar: 31gProtein: 5g

This nutrition info is based on the exact ingredients and brands that I used a the time. It may not be 100% accurate. Please check your ingredients nutrition labels.

Related: Gluten-Free Shepherd's Pie