Grease the inside of each mold with a light coating of non-stick spray.
Disregard the directions on the box of cake mix. Instead, beat the egg whites until stiff. In a separate bowl combine cake mix with water and beat until thoroughly blended (about 2 minutes). Fold egg whites into the cake batter and slowly combine until completely mixed.
Pour the batter into the molds, filling each one about 3/4 of an inch. Bake in the preheated oven for 30 minutes, or until the cake is golden brown and a toothpick stuck in the center comes out clean.