Ingredients
Equipment
Method
Bake and cool
- Bake the white cake in a 9x13 pan according to package directions, then let it cool for 15 minutes so it doesn’t release steam while soaking.
Poke the cake
- Using the handle of a wooden spoon, poke holes all over the cake about 1 inch apart so the Jell-O can soak through evenly.
Soak with strawberry Jell-O
- Dissolve the strawberry Jell-O in 1 cup boiling water, stir in 1/2 cup cold water, then pour slowly over the left half of the cake to fill the holes.
Soak with blue Jell-O
- Dissolve the berry blue Jell-O in 1 cup boiling water, stir in 1/2 cup cold water, then pour over the right half of the cake to create the red and blue stripes.
Chill
- Refrigerate the cake for at least 2 hours until the Jell-O is fully set inside the cake so it slices cleanly.
Top and garnish
- Spread the whipped topping evenly over the top of the chilled cake, then decorate with red and blue star sprinkles and fresh strawberries and blueberries before serving.
Notes
For the cleanest slices, chill until the Jell-O feels fully firm when you press lightly near the center. Store covered in the refrigerator up to 4 days; freeze is not recommended because the Jell-O and whipped topping texture can change. For a lighter option, use an alternative whipped topping that fits your preference (such as reduced-fat whipped topping) and keep the chilling time the same.
