Prepare the box cake mix according to the package and bake according to the instructions for a 9×13 pan.

Let the baked cake cool completely.

In a small bowl, combine 1 cup boiling water and Jell-O and stir until gelatin is dissolved, stir in the ½ cup cold water.

Poke the cake with the handle of a wooden spoon or the tines of a meat fork halfway into the cake at ½ - 1-inch intervals.

Carefully pour the strawberry gelatin evenly over the top of the cake.

Cover and chill for at least 4 hours.

Mix instant pudding with only 1 cup of milk. Let it sit a minute until slightly stiff. Fold in the thawed 8 oz tub of Cool Whip.

Spread the cool whip mixture over the top of the cake and garnish with sliced strawberries right before serving.