The “secret ingredient” in these coconut-infused blueberry cupcakes--mashed potatoes--gives the cake great texture, almost like pound cake. The fluffy frosting is just fun. Because it's low in calories and fat, you can spread or pipe a generous amount on top of each cupcake to make them look extra festive. The frosting stiffens as it stands, so be sure to put it on the cupcakes right after you make it. Download a FREE Top 10 Diet Recipes Cookbook!