Do not thaw.
Microwave (1100W): Remove cake from plastic wrapper and place right side up on microwave safe plate. Heat on High for 1 minute. Invert cake onto plate, remove cup and serve.
Oven: Preheat oven to 350°F. Remove cakes from box and plastic wrapper. Place cakes right side up on a baking sheet. Bake for 14-16 minutes. Let cakes stand in their cups for 1-2 minutes. Invert cake onto plate, remove cup and serve.