For the cupcakes: Preheat the oven to 350 degrees F. Spray 2 cupcake pans with cooking spray.
With an electric mixer, beat the cake mix, gelatin, oil, strawberries and a 1/2 cup water until fully combined. Add the eggs, one at a time, beating well after each addition. Pour the batter into the prepared pans. Bake until a toothpick inserted in the center of the cupcakes comes out clean, about 20 minutes. Let cool in the pan, and then remove before icing.
For the icing: In a blender or food processor, puree the butter, sugar and strawberries for the glaze until smooth; it may take a few minutes to come together. Poke holes in the cupcakes with a toothpick, then spoon the icing over, allowing some of it to seep into the cake. Store the cupcakes, covered in the refrigerator, for up to 2 weeks.
Recipe adapted from Home Cooking with Trisha Yearwood (c) Clarkson Potter 2010