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Sweet Potato Casserole with Marshmallows - The Best Sweet Potato Casserole Ever

Sweet Potato Casserole with Marshmallows

This warm and comforting Sweet Potato Casserole with Marshmallows is the perfect blend of creamy, spiced sweet potatoes and a golden, gooey marshmallow topping. A festive twist on a classic family favorite, perfect for holidays or cozy dinners.
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Prep Time 20 minutes
Cook Time 25 minutes
Cooling Time 15 minutes
Total Time 1 hour
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 280
Ingredients Equipment Method Notes

Ingredients
  

Sweet Potato Mixture
  • 4 pounds sweet potatoes peeled and quartered (about 4–5 large potatoes)
  • 1/2 cup brown sugar plus extra for sprinkling
  • 1/3 cup butter melted, plus extra for greasing dish
  • 1/4 cup sour cream optional, for extra creaminess
  • 1/2 tsp ground cinnamon
  • 1/4 tsp ground nutmeg
  • salt and pepper to taste
Topping
  • 2 cups mini marshmallows plus extra for topping

Equipment

  • 9x13-inch Baking Dish
  • Large Pot
  • Mixing Bowl
  • Potato masher or hand mixer

Method
 

  1. Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter.
  2. Place peeled, quartered sweet potatoes in a large pot. Cover with water, add salt, and boil until tender, about 15–20 minutes. Drain well.
  3. Transfer the drained sweet potatoes to a large mixing bowl. Add melted butter, brown sugar, sour cream (if using), cinnamon, nutmeg, salt, and pepper. Mash until smooth and creamy.
  4. Spoon the mashed sweet potato mixture into the prepared baking dish and smooth the top.
  5. Sprinkle mini marshmallows evenly over the top. Add extra marshmallows if desired for a thicker topping.
  6. Bake for 20–25 minutes or until the marshmallows are puffed and golden brown. Watch carefully to avoid burning.
  7. Let cool for 5–10 minutes before serving. Enjoy warm!

Notes

You can make the mashed sweet potatoes a day in advance and refrigerate. Just add the marshmallows and bake when ready to serve. For a vegan version, use dairy-free butter and marshmallows.