Boston Market Sweet Potato Casserole

This Boston market sweet potato casserole will be an instant holiday favorite. It has smooth and creamy sweet potatoes topped with ooey-gooey marshmallows and a melt-in-your-mouth brown sugar oat topping. Serve it as a side for Thanksgiving or even for dessert, and watch it become your family's favorite dish at the table! I've recreated a bunch of restaurant favorites that are perfect for the holidays, like this Rudy's Creamed Corn and Ruth Chris Creamed Spinach, and this sweet potato casserole always stands out for its simplicity yet restaurant-worthy results.

Why I Love This Sweet Potato Casserole Recipe

I grew up going to Boston Market with my grandma, and while I always went for the rotisserie chicken and mashed potatoes, she never skipped the sweet potato casserole. I didn’t appreciate it as a kid, but years later, when I finally tried it again, I realized just how amazing it really was — rich, creamy, and full of cozy holiday flavors.

Since then, I’ve become completely obsessed with creating sweet potato recipes that capture that same nostalgic taste — like my sweet potato pudding and sweet potato pound cake— and this casserole is the one that brings it all full circle. It’s my homemade version of the classic Boston Market Sweet Potato Casserole, and honestly, I think it’s even better.

The filling is soft, buttery, and perfectly spiced with cinnamon and nutmeg, while the topping is what makes this casserole irresistible — a mix of brown sugar, oats, and marshmallows that caramelize in the oven for a sweet, slightly crunchy finish. Every bite is warm, rich, and addictive.

What I love most, though, is how easy it is to make. You can bake the sweet potatoes, mix everything together, and pop it in the oven while you finish prepping for guests — or enjoy a well-deserved glass of wine. It’s the ultimate make-ahead dish for the holidays!

This sweet potato casserole is also the perfect side dish for Thanksgiving dinner, but it’s so good it doubles as dessert. Whether you’re serving it alongside turkey and stuffing or with a scoop of vanilla ice cream, it’s sure to steal the show.

Ingredients You'll Need

• 2 large sweet potatoes
• 6 tablespoons butter, divided
• 2 eggs
• ½ cup heavy cream
• ½ cup all-purpose flour
• ½ cup walnuts, chopped
• 1 cup rolled oats
• 2 teaspoons cinnamon
• ½ teaspoon nutmeg
• 1 ½ cups brown sugar
• 2 cups mini marshmallows

How To Make Boston Market Sweet Potato Casserole

Step 1: Bake the sweet potatoes

Preheat the oven to 350°F (175°C). Then, wrap the sweet potatoes in foil, place them on a baking sheet, and bake for about 1 hour. You'll know the potatoes are done when you can easily pierce them with a fork. 

Step 2: Mash the potatoes

Allow the sweet potatoes to cool until you can handle them. Then remove the foil, and peel the skin off the potatoes. It should peel off pretty easily. After that, place the cooked potatoes into a large bowl and mash them with four tablespoons of butter. I used a potato masher, but if you don't have one, a large fork will work too.

Step 3: Complete the sweet potato mash

Add the eggs, cinnamon, nutmeg, 1 cup of brown sugar, and heavy cream to the bowl with the potatoes. Mix well until everything is smooth, creamy, and fully combined. 

Step 4: Transfer to a Baking dish

Lightly coat a 9x13-inch baking dish with a little cooking spray. Then, pour the mashed sweet potatoes into the dish and smooth them out into an even layer with a rubber spatula.

Step 5: Make the crumble

Combine the flour, brown sugar, oats, and cinnamon in a medium bowl and stir until well combined. Mix in the butter with a fork until you have the ingredients form a crumbly mixture. If you're using chopped walnuts, add them to the mixture and mix.

Step 6: Top the casserole

Top the sweet potato mixture with the mini marshmallows. Then crumble the cinnamon-oats mixture on top of the marshmallows. Make sure the entire pan is covered with toppings so you get texture contrast in each bite.

Step 7: Bake and serve

Put the dish in the oven and bake for 30-45 minutes or until the marshmallows are golden brown. Serve warm right out of the oven, and enjoy!

Boston Market Sweet Potato Casserole FAQS

Can I use canned sweet potatoes instead of fresh?

Yes — you can absolutely make this Boston Market Sweet Potato Casserole with canned sweet potatoes! Just be sure to use unsweetened canned sweet potatoes or yams (the kind packed in water, not syrup). Drain them well, warm them slightly, and mash until smooth before mixing with the other ingredients. You can skip the baking step since canned sweet potatoes are already cooked. The result will still be rich, creamy, and just as flavorful.

How do I make it taste exactly like Boston Market’s?

The secret is in the spices and texture. Use plenty of cinnamon and nutmeg for that signature warmth, and don’t over-mash your sweet potatoes — a few small chunks give it that rustic, homemade Boston Market feel. The marshmallow topping is key, too: bake just until the top turns golden brown and caramelized for that authentic restaurant-style flavor.

Can I make this sweet potato casserole ahead of time?

Definitely! This is one of the best make-ahead Thanksgiving side dishes. You can prepare the casserole up to two days in advance, assemble it in the baking dish, and cover it tightly with foil or plastic wrap. Store it in the refrigerator, then bake it just before serving. If you’re short on time, you can also bake it completely, cool it, and reheat at 350°F (175°C) for 20 minutes before serving.

Can I freeze sweet potato casserole?

Yes — this casserole freezes really well. Once baked and cooled completely, cover it tightly with foil or transfer it to an airtight container and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating. If freezing before baking, add the marshmallows and crumble topping right before cooking to keep the texture perfect.

How do I make this casserole nut-free?

If you’re serving guests with nut allergies, simply omit the walnuts in the crumble topping. You can replace them with extra oats, crushed graham crackers, or even pumpkin seeds for a similar crunch without the nuts.

Can I make this casserole without marshmallows?

Of course! If you’re not a fan of marshmallows, skip them and double the oat crumble topping instead. It will bake into a buttery, crisp, sweet layer that’s just as satisfying — similar to a streusel.

What should I serve with Boston Market Sweet Potato Casserole?

This sweet and buttery casserole pairs perfectly with other Thanksgiving classics like roast turkey, glazed ham, or crock pot turkey tenderloin. It’s also amazing alongside comfort foods like meatloaf with stuffing, seafood stuffing, or Thanksgiving classics like Ocean Spray cranberry sauce. For dessert, it complements pumpkin pie or pecan pie — truly the side dish that ties your whole holiday meal together.

Holiday Copycat Recipes To Try Next

• Velveeta broccoli casserole
• Burger King hershey sundae pie
• Patti Labelle's sweet potato pie
• Tini's mac and cheese
• Hilly's pumpkin pie