Galaxy Pinata Cake

READY IN: 3hrs 55mins


  • 2
    (15 1/4 ounce) packages white cake mix
  • 2
    cups water
  • 1
    cup vegetable oil
  • 4
    (16 ounce) cans white frosting
  • purple gel food coloring
  • galaxy candy sprinkles
  • M&M', blue
  • rock candy, blue & purple & white
  • carbonated candy, blue pop rocks
  • 2
    (1 ounce) packages gelatin
  • 23
    cup and 2 tablespoons cold water, divided
  • 1
    cup sugar
  • gel food coloring, navy blue & light blue & magenta & purple
  • silver edible glitter
  • silver star candy sprinkles


  • 4-inch round cutter & pastry bag & 1-inch round pastry tip & candy thermometer & large offset spatula & small paintbrush.
  • Preheat the oven to 350 degrees F and line 4 (8-inch) cake pans with parchment paper and spray with non-stick cooking spray.
  • In a large bowl, stir together cake mixes, eggs, water, and oil until thoroughly combined.
  • Evenly divide batter between the prepared cake pans. Bake for about 35 minutes until a tester inserted into the center of the cake comes out clean. Set aside to cool.
  • Once completely cooled, remove from pans. Use a serrated knife to level off the domed tops of the cakes.
  • In a large bowl, place the contents of the cans of frosting. Add purple food coloring until the desired color is reached and mix until fully incorporated. Fit piping bag with a large round tip. Add purple frosting.
  • Attach one cake layer to a cake board with a dollop of frosting. Place a 4-inch circle cookie cutter in the center of the cake and fully frost around it, leaving the area inside the cookie cutter bare. Then, use the cookie cutter to cut out a center hole in the middle of the next 2 layers.
  • Place a layer on top of the first, frost the ring of cake, then place the next cut layer on top.
  • Fill the center cavity of the cake with a mix of galaxy sprinkles, M&Ms, rock candy, and Pop Rocks.
  • Add a final layer of frosting around the cake ring and attach the last cake layer upside down.
  • Frost the top and sides of the cake with a thin, even layer of frosting to trap in any crumbs. Chill cake, uncovered, in fridge for 30 minutes.
  • Once chilled, add a 1/2-inch layer of frosting around the entire cake with the remaining frosting. Smooth the tops and sides of the cake. Make sure top coat is straight and level. The smoother the coat of frosting, the better the mirror glaze will adhere.
  • Chill in fridge 1 hour.
  • Place white chocolate chips in a large bowl. Set aside.
  • Whisk together 1/3 cup cold water and gelatin in a small bowl until smooth. Set aside.
  • In a small pot over medium-high heat, stir together 1/3 cup and 2 tablespoons water, sugar, and corn syrup. Bring to a boil.
  • Remove from heat and whisk in gelatin. Mix until smooth. Add condensed milk and mix until combined.
  • Pour mixture over white chocolate chips. Whisk until smooth.
  • Stir occasionally while the mixture cools to 95 degrees F, using candy thermometer.
  • Take out 3/4 cup of the mixture and divide between 3 bowls.
  • Color the large portion navy blue. Color the three smaller portions light blue, magenta, and purple.
  • Place cake on an upside bowl glass or cake pan set on a parchment-lined baking sheet. The diameter of the glass or pan should be smaller than the diameter of the cake.
  • Once the temperature of the glazes reaches 90 degrees F, pour the dark blue glaze all over the cake. The excess glaze will run down the sides of the cake and into the pan.
  • Using a spoon, create streaks across the cake with the light blue, magenta, and purple glazes.
  • Gently glide a large offset spatula across the top of the cake to smooth the top and create a marbled effect. Let the excess glaze drip off.
  • Use a small paint brush to splatter glitter all over the cake, then sprinkle with silver stars.
  • Once the glaze has set, about 20 minutes, cut off the excess glaze drips. Cake can be stored, covered, for up to 5 days in the fridge.