Rainbow Jello Cake Recipe

Unleash a burst of color and flavor with this Rainbow Jello Cake, where each slice serves up a vibrant, tasty surprise. This playful dessert combines fruity layers of gelatin with a fluffy white cake base, topped with creamy whipped topping and optional rainbow sprinkles for a festive finish. Perfect for birthdays, parties, or any occasion that calls for a touch of whimsy.


  • 1 (15.25-ounce) box of white cake mix
  • 1 cup cold water
  • ½ cup vegetable oil
  • 4 egg whites, room temperature
  • 3 cups boiling water
  • 1 (3-ounce) box of strawberry gelatin mix
  • 1 (3-ounce) box of orange gelatin mix
  • 1 (3-ounce) box of lemon gelatin mix
  • 1 (3-ounce) box of lime gelatin mix
  • 1 (3-ounce) box of berry blue gelatin mix
  • Red, orange, yellow, green, and blue food color gel
  • 1 (8-ounce) container of Cool Whip whipped topping, thawed
  • Rainbow sprinkles, optional garnish


  1. Preheat the Oven:
    • Set your oven to 350°F (175°C). Grease a 9×13 inch baking dish.
  2. Mix and Bake the Cake:
    • In a large bowl, combine the cake mix, water, oil, and egg whites. Beat until smooth.
    • Pour the mixture into the prepared baking dish. Bake for 25-28 minutes or until a toothpick inserted into the center comes out clean.
  3. Poke Holes:
    • Allow the cake to cool slightly, then use a chopstick to poke holes throughout the cake at regular intervals. Ensure the cake cools completely afterward.
  4. Prepare Gelatin:
    • In separate bowls, dissolve each box of gelatin mix in ½ cup of boiling water. Add 5-7 drops of corresponding food color to each gelatin mixture.
  5. Add Gelatin to Cake:
    • Carefully pour or spoon the colored gelatin into the holes in the cake, alternating colors for a rainbow effect. Avoid overfilling the holes.
  6. Chill the Cake:
    • Cover the cake with plastic wrap and refrigerate for at least 2 hours to allow the gelatin to set.
  7. Frost and Garnish:
    • Once chilled, spread the whipped topping evenly over the cake. If desired, sprinkle with rainbow sprinkles for an extra festive look.
  8. Serve:
    • Slice the cake and serve chilled for a refreshing, fun dessert.


  • Perfect Holes: Use a chopstick for making holes as it provides the perfect diameter—not too large to avoid the gelatin from spilling out.
  • Added Fun: For a more creative presentation, consider using cookie cutters to cut gelatin squares into fun shapes to place on top of the cake.
  • Storage: Keep the cake refrigerated until ready to serve to ensure it remains fresh and the gelatin stays firm.

Prep Time: 30 minutes

Cook Time: 28 minutes

Chill Time: 2 hours

Total Time: About 3 hours

Yield: 12 servings

Category: Dessert

Method: Baking

Cuisine: American

Diet: Vegetarian


This Rainbow Jello Cake is not just a visual treat but also a delightful dessert that’s sure to capture the hearts of both kids and adults. With its easy preparation and stunning presentation, it’s the perfect addition to any celebration, offering a slice of joy and color to everyone at the table. Enjoy the process of creating this fun, flavorful cake and the smiles it brings to your guests’ faces!

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