Letha says that this is a yummy recipe...from The Taste of Home Cookbook:
4 pounds sweet potatoes/about 5 large peeled and cubed
1 cup milk
1/2 cup packed brown sugar
6 tablespoons butter, softened
1 egg, lightly beaten
1 1/2 tsp ground cinnamon
1 1/2 tsp vanilla extract
3/4 tsp ground allspice
1/2 tsp salt
1/4 tsp ground nutmeg
18 large marshmallows
1) place sweet pototoes in a large saucepan; cover with water. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or until tender; drain.....(seems like you could used canned instead)
2) Transfer into a large mixing bowl and mash. Add the next nine ingredients, beat until smooth. transfer to a greased shallow 2 1/2 quart baking dish. Bake, uncovered, at 350 for 40-45 minutes or until heated through.
3) top with marshmallows, bake 5-10 minutes longer or just until marshmallows begin to puff and brown.