1 (2 layer size) pkg. white cake mix
1 (3 oz.) pkg. Jello gelatin (any flavor)
1 c. boiling water
1/2 c. cold water

Preheat oven to 350 degrees. Grease and flour 13 x 9 inch pan. Prepare cake mix as directed on package and bake for 30 to 35 minutes. Cool in pan 15 minutes; poke with fork at 1/2 inch intervals. Dissolve gelatin in boiling water. Add cold water and spoon over cake in pan. Chill 3 to 4 hours. Top with whipped topping.