Boston Market Copycat Sweet Potato Casserole

Sweet Potatoes
3 ½ - 4 pounds sweet potatoes, peeled and cut into 1” pieces
4 tablespoons (½ stick) unsalted butter
¾ cup packed light brown sugar
½ cup heavy cream
1 teaspoon kosher salt
1 tablespoon pure vanilla extract
1 teaspoon ground cinnamon
¼ teaspoon ground nutmeg

Topping
2 cups mini marshmallows
½ cup flour
4 tablespoons butter unsalted butter
6 tablespoons packed light brown sugar
¼ cup old fashioned rolled oats
¼ teaspoon ground cinnamon

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 pot.  Mash potatoes with a potato masher or blend with an electric mixer, until mostly smooth.  Add remaining ingredients (except topping ingredients).  Mix until combined.

Preheat oven to 350°F.  Grease an 8”x10” casserole dish (8x8 or 9x9 works too).  

Spoon sweet potatoes into 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 top of casserole.

Bake for 20-25 minutes until streusel is crisp and marshmallows are golden brown.

Serve and enjoy!