Sweet Potato Casserole

3 cups mashed sweet potatoes
2 eggs
½ cup butter, melted
1 cup sugar
½ cup whole milk
1 ½ cups brown sugar
1 ½ cups chopped pecans
1/3 cup flour
½ cup butter, cut into little pieces
Marshmallows

Preheat oven to 350˚ F. Peel and cut up sweet potatoes and cook in a large pot until tender. Drain and mash in a large bowl. Measure out 3 cups of potatoes and combine with eggs, melted butter, milk, and sugar. Blend with mixer until well blended. Pour into a medium – large casserole dish and set aside. In separate bowl, mix brown sugar, pecans, flour, and pieces of butter. Sprinkle mixture on top of the casserole mixture and bake for 25 minutes. Add marshmallows on top of casserole and continue to bake for 5 minutes.