Fallout Jello Cake
Learn how to make the Fallout Jello Cake step by step and impress your friends with a vault dweller treat they won’t forget.
Equipment
- 1 x 8.5" Jello Mold
- 1 x 6" Jello Tower Mold
- 1 x 11" x 15" Sheet Cake Pan
- 2 x 1/8 Sheet Aluminum Pans
- 1 x 10" Round Cake Board cut down to 9" size
- 1 x 8" Round Cake Board cut down to 7" size
- 1 x 14" x 19" Cake Board
- 2 x Piping Bags
- 2 x Star Tips
- 1 x Stand Mixer or Hand Mixer
Ingredients
Cake
- 2 boxes Pillsbury 15.25 oz. White Cake Mix (plus ingredients needed on box)
Jello
- 4 boxes Blue Jello 3 oz. size
- 7 boxes Red Jello 3 oz. size
- 11 cups Water
Buttercream Frosting -Yields 5 Cups
- 2 cups Unsalted Butter softened
- 8 cups Powdered Sugar
- ½ cup Heavy Whipping Cream
- Yellow Food Coloring
- Salt as needed
Whipped Cream
- 1-1/2 cups Heavy Whipping Cream
- ½ cup Powdered Sugar
Instructions
Jello
- Prep the Jello molds and pans by greasing with cooking oil.
- For the Blue Jello: Mix 4 boxes of Jello into 4 cups of boiling water and stir until dissolved.
- Pour into 8.5" Jello mold until full, then pour the remaining liquid into a 1/8 sheet pan for the blue Jello squares decoration.
- For the Red Jello: Mix 6 boxes of Jello into 6 cups of boiling water and stir until dissolved.
- Pour into 6" Jello tower mold until full.
- Make an additional batch of red Jello with the remaining box of Jello and 1 cup of water.
- Pour into 1/8 sheet pan for the red Jello squares decoration.
- Chill the Jello in the refrigerator for at least 3 hours until set firm.
Cake
- Follow the instructions on the back of the box for baking the cake. For an 11x15 cake, you will need to bake for about 45 minutes. Use the toothpick method to check for doneness.
- Set aside and let fully cool while you work on the next steps.
Buttercream Frosting
- With a hand mixer or stand mixer fitted with the paddle attachment, whip the softened butter on medium speed for about 2 minutes until creamy.
- Add the powdered sugar, then the heavy cream, and continue mixing on low to incorporate, then switch to medium-high speed and beat for another 2 minutes. Add salt as needed and mix well.
- Add about 2 cups of the frosting to a small bowl and mix in yellow food coloring until you achieve a pale yellow color. Add to a piping bag with a star tip and set aside.
- Frost the cake with the white frosting.
- Pipe a decorative border along the top and bottom edge of the cake with the yellow frosting.
- Chill in the refrigerator uncovered for half an hour to set up.
Whipped Cream
- Beat cold whipping cream and sugar on medium-high speed until stiff peaks form.
- Add to a piping bag with a star tip and store in the refrigerator until needed.
Assembling the Fallout Jello Cake
- Transfer the blue Jello onto a 9" cardboard cake board.
- Transfer the red Jello onto a 7" cardboard cake board.
- Place the blue Jello in the center of the cake, then place the red Jello on top being careful to keep everything centered.
- Pipe the whipped cream around the base of both Jello molds making sure to hide the cake rounds.
- Cut squares out of the red and blue Jello pans and scatter these randomly on top of the cake.
- Add a "Congrats!" cake topper if so desired.
- Serve immediately.
Notes
Be sure to check the full post for additional tips.
This will yield approx. 40 slices of cake that are roughly 2" x 3" in size.
Tips for getting Jello to release from the mold:
Dip the outside of the mold in hot water for a few seconds to help it release. Anywhere from 5 seconds to 30 seconds depending on how hot your water is. Keep in mind that the aluminum mold will heat up faster than the plastic one, so go in 5-second intervals and keep an eye out for when the outer edge starts to look loose. Then you know it’s ready.
If it looks too runny you have melted it too much. Just stick it back in the fridge for a few minutes to re-solidify.
Tried this recipe?Let us know how it was!
