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Sweet Potato Casserole with Marshmallows

Sweet Potato Casserole with Marshmallows is a classic, decadent side dish that is perfect for any holiday event. In this dish, mashed sweet potatoes are combined with milk, brown sugar, butter and spices, and features a delicious pecan streusel crust. And topped with mini marshmallows, of course!
Prep Time 45 mins
Cook Time 45 mins
Total Time 1 hr 30 mins
Servings 10


  • 4-5 large sweet potatoes peeled and cut into small cubes
  • ½ cup milk
  • 1 cup brown sugar
  • ¼ cup salted butter  melted
  • 2 eggs
  • tsp cinnamon
  • 1 tsp nutmeg
  • 2 tsp vanilla
  • ½ tsp salt


  • cup flour
  • cup brown sugar
  • 1 tsp cinnamon
  • ½ tsp nutmeg
  • 4 tbsp salted butter melted
  • 3 cups mini marshmallows
  • ½ cup chopped pecans


  • Preheat the oven to 350 degrees.
  • Fill a large pot with water and the diced sweet potatoes. Bring to a boil and continue boiling until the potatoes are tender and soft.
  • Drain the potatoes from the boiling water and place them in a large mixing bowl (I prefer using a Kitchen Aid Mixer). Add in the milk, brown sugar, butter, eggs, cinnamon, nutmeg, vanilla and salt. Mix on medium speed until you have a creamy mashed potato.
  • Smooth out the potato mixure in a 9x13 dish. Pop the dish into the 350 degree oven for 25 minutes.  If you are planning on making this ahead of time, you could also make the mashed potato mixture a few days ahead.  Then pop it into the oven when you’re ready to finish baking it.
  • While the mashed potato mixture is baking, get a medium sized bowl. Add in the flour, brown sugar, cinnamon, nutmeg, and chopped pecans. Stir until eveything is mixed well.
  • Add the melted butter to the streusel topping and stir until everything is combined.
  • Carefully add the mashed potatoes from the oven. Sprinkle the top with the streusel mixture. Then carefully add the mini marshmallows to the streusel mixture.
  • Place the marshmallow and streusel topped potatoes back in the oven for an addtional 10 minutes. You can also turn on the broiler to toast the marshmallows at bit more. Make sure you keep an eye on it!