1 (18.25 ounce) box white or yellow cake mix
1 small box gelatin, any flavor
1 cup boiling water
1/2 cup cold water
1 large container Cool Whip or desired frosting

Bake cake as per instructions on box. Leaving cake in pan, prick cake with a large, two-pronged fork at 1/2-inch intervals. Dissolve gelatin in boiling water. Add cold water and spoon over cake. Chill cake in the pan for 4 hours. Dip pan in warm water for 10 seconds; unmold onto a serving plate. Frost. Garnish as desired, and refrigerate.