- Prepare the cake batter according to the directions on the box. (you can add an extra egg to the mixture for fluffier cupcakes.) - place cupcake liners in muffin tins - add a small amount of cake mix to cupcake liners and then add a banana slice - repeat previous step until you have filled cupcake liner about 3/4 full - bake according to directions on box (about 15-17 minutes) - once cupcakes have cooled, ice them with chocolate icing - add a slice of banana on top of iced cupcakes for decoration - Enjoy!