It most certainly can be used to make cupcakes. Using muffin liners in your muffin pans, cook your cake mixture for a shorter time than you would for a whole cake, and fill the muffin liners to only halfway. Once cooled, poke holes in the cupcakes and carefully spoon your strawberry gelatin milk mixture over them. Refrigerate until it's set, top, and decorate as per the recipe instructions.