Step 1

Preheat oven to 350 degrees F. Spray a 9x13 baking dish with cooking spray.

Step 2

In a large bowl mix together the sweet potatoes, butter, white and brown sugars, eggs, milk, and cinnamon.

Step 3

Spread the sweet potato mixture evenly into a prepared 9 x 13 baking dish.

Step 4

Sprinkle the mini marshmallows evenly over the top in a single layer. (Don't overload the marshmallows.

Step 5

Bake at 350 degrees F for about 30 minutes or just until the marshmallows are golden brown.