1 (13 x 9 x 2 inch) white cake, baked and cooled
1 (8 oz.) serving Jello brand gelatin, any flavor
2 c. boiling water
1 (8 oz.) container Cool Whip, thawed

Prick cake with fork at 1/2 inch intervals. Dissolve gelatin in boiling water. Spoon over cake. Chill 2 hours. Top with whipped topping. Chill.