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Sweet Potato Casserole with Marshmallows

 3 ½ 4 lb. sweet potatoes, peeled and cut into 1 inch pieces
 4 tbsp (½ stick) unsalted butter
 ¾ cup packed light brown sugar
 ½ cup heavy cream
 1 tsp Kosher salt
 1 tbsp pure vanilla extract
 1 tsp Ground cinnamon
 ¼ tsp Ground nutmeg
Topping
 2 cups mini marshmallows
 ½ cup all-purpose flour
 4 tbsp unsalted butter
 6 tbsp packed light brown sugar
 ¼ cup old fashioned rolled oats
 ¼ tsp Ground cinnamon
1

Preheat oven to 350℉ . Grease an 8”x10” casserole dish. Fill a large pot with sweet potato pieces and water. Bring to a boil over high heat. Cook until fork tender. Drain potatoes and place back into the pot. Mash potatoes with potato masher or blend with an eclectic mixer, until mostly smooth. Add remaining ingredients (except topping ingredients). Mix until combined. Spoon sweet potatoes into a casserole dish and smooth out. Sprinkle top of sweet potatoes with marshmallows. Melt butter in a medium microwave safe bowl. Add remaining ingredients. Mix with a fork. Sprinkle over the top of the casserole. Bake for 20-25 minutes until the streusel is crisp and marshmallows are golden brown.
Serve and enjoy!