Step 1

Preheat the oven to 350º Fahrenheit. Spray a 9x13 baking pan with cooking spray.

Step 2

In the bowl of a stand mixer (or use a hand mixer), mix the cake mix, milk, eggs and oil for 2 minutes, scraping the sides of the bowl as needed.

Step 3

Pour the cake batter into the prepared pan.

Step 4

Bake for 21-26 minutes or until the center of the cake bounces back when you touch it.

Step 5

Allow the cake to cool for 5 minutes, then poke holes all over the top of the cake using a long-tined fork or a skewer.

Step 6

Mix the jello powder with the boiling water. Use a whisk to stir until the powder dissolves. Then mix in the cold water.

Step 7

Pour the jello over the cake so that it soaks into the holes.

Step 8

Allow the cake to cool for 1 hour in the refrigerator.

Step 9

Spread lemon curd evenly over the top of the cake.

Step 10

Then spread Cool Whip evenly on top of the lemon curd.

Step 11

Decorate with lemon zest or sliced lemons.

Step 12

Store in the refrigerator until serving.