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Old-Fashioned Sweet Potato Casserole

A white casserole dish filled with old-fashioned sweet potato casserole, topped with a golden brown pecan crumble and a creamy layer, with a serving scooped out.

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A creamy and sweet Old-Fashioned Sweet Potato Casserole topped with marshmallows and a crunchy streusel, perfect for Thanksgiving or Christmas dinners.

  • Author: Emily
  • Prep Time: 20 minutes
  • Cook Time: 1 hour 35 minutes
  • Total Time: 1 hour 55 minutes
  • Yield: 8 servings
  • Category: Side Dish
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

  • 4 large Sweet Potatoes
  • 10 tbsp Butter, divided
  • 1/2 cup Half-and-Half
  • 1 1/3 cup Brown Sugar, divided
  • 1 tbsp Vanilla Extract
  • 3/4 tsp Nutmeg, divided
  • 3/4 tsp Cinnamon, divided
  • 2 1/2 cups Mini Marshmallows
  • 1/2 cup All-Purpose Flour
  • 1/4 cup Quick Oats

Instructions

  1. Preheat oven to 400°F. Line a baking sheet with foil, wash and pierce sweet potatoes, and bake for 1 hour.
  2. Remove skins and place sweet potatoes in a large bowl. Mash or beat until smooth.
  3. Add 6 tbsp butter, vanilla, half-and-half, 1 cup brown sugar, 1/2 tsp cinnamon, and 1/2 tsp nutmeg. Beat until creamy.
  4. Preheat oven to 350°F. Butter a 2-quart casserole dish and spread the sweet potato mixture evenly.
  5. Top with mini marshmallows.
  6. In a small bowl, melt 4 tbsp butter. Mix with flour, quick oats, 1/3 cup brown sugar, and remaining spices until crumbly.
  7. Sprinkle streusel topping over marshmallows.
  8. Bake for 30–35 minutes or until topping is golden and marshmallows are toasted.

Notes

  • You can prepare the casserole up to 2 days in advance before baking.
  • Use canned sweet potatoes in a pinch but drain syrup well.
  • For a pecan topping, add chopped pecans to the streusel or as a replacement for marshmallows.
  • To freeze, assemble unbaked casserole and freeze for up to 3 months.