Step 1

Preheat oven to 350 degrees F (175 degrees C).

Step 2

Place sweet potatoes in a large saucepan with enough water to cover. Bring to a boil, and cook until tender, about 15 minutes. Remove from heat, drain, and mash.

Step 3

Place mashed sweet potatoes in large bowl, and use an electric mixer to blend with the margarine, brown sugar, orange juice, and cinnamon. Spread evenly into a 9x13 inch baking dish. Top with miniature marshmallows.

Step 4

Bake for 25 to 30 minutes in the preheated oven, or until heated through, and marshmallows are puffed and golden brown.