Spray a cookie sheet with Pam (non-stick cooking spray).
Sift powdered sugar and cocoa together in a medium sized bowl and set aside.
In a large bowl beat egg whites until frothy.
Add granulated sugar to egg whites one tablespoon at a time, beating well after each addition and continue beating until it is stiff and glossy (meringue).
Beat in vanilla.
Fold cocoa/sugar mixture and cereal flakes into meringue.
Drop meringue onto cookie sheets using 2 teaspoons of meringue per cookie - one inch apart making 28 kisses.
Bake for 20 minutes or until kisses are dry and set.
Cool on baking sheets for 5 minutes and then remove kisses to a cooling rack to continue cooling.