Step 1

Prepare cake as directed on the box and bake in a 9-x-13-inch baking dish. Let cool for 15 minutes.

Step 2

Poke cake with a fork at ½–1-inch intervals.

Step 3

Use hot and cold water to make Jell-O as directed on the package.

Step 4

Spoon Jell-O liquid over the cake gradually until it is all absorbed.

Step 5

Chill in the refrigerator for 3–4 hours. Top with whipped topping right before serving.