Step 1

Make the cake according to the box instructions in a 9x13-inch baking pan. Remove it from the oven and set aside to cool for 15 minutes.

Step 2

While the cake cools, whisk the jello and boiling water in a medium bowl until dissolved. Stir in the cold water.

Step 3

Using a fork or toothpick, poke holes all over the top of the warm cake. Carefully pour the jello mixture over the cake, then refrigerate for 2-3 hours.

Step 4

Once the jello has set, spread the Cool Whip evenly over the top of the cake.

Step 5

Garnish with fresh strawberry slices, and enjoy!