Place sweet potato in a large saucepan; cover with water. Bring to a boil; cook 20 minutes or until tender. Drain well; return sweet potato to pan. Beat at medium speed of a mixer until smooth; add banana and next 4 ingredients, beating well.
Preheat oven to 350°.
Pour sweet potato mixture into an 11- x 7-inch baking dish coated with cooking spray. Sprinkle mixture with flaked coconut. Bake at 350° for 30 minutes or until thoroughly heated.