Preheat the oven to 350 degrees and spray the 3 cake pans with pam baking spray
Combine all cake ingredients into a standing mixer or large mixing bowl and beat until combined
Mix in a few drops of pink gel frosting until combined
Divide the batter between the 3 pans and bake in the oven for 28-32 minutes or until a toothpick comes out clean
Allow to cool completely before moving onto the cake board
Using a cake leveler, remove the dome from the cakes to make even
Using a standing mixer, beat together the butter, powdered sugar, vanilla, and heavy whipping cream until combined, smooth and stiff with peaks
Building the cake directions
Place one cake round onto the cake board.
Using a 3 inch round cookie cutter, cut out the center of the cake
Carefully remove the center. Cut the center round in half and gently place the new cut half back into the center of the cake to create a bottom to the cake
Frost the bottom layer and the walls of the center of the cake
Cut out the center of the second cake layer and gently place it on top of the first
Frost second layer and inside walls of the center
Fill the center of the cake with about 1 ½-2 C of jelly beans
Place the third layer of the cake on top
Scoop 1 C of frosting into the piping bag
Frost entire cake with remaining frosting
Divide the premade frosting into 3 bowls
Mix in a few drops of each color into their own bowl
Place each bowl, 1 at a time into the microwave for 15 seconds to soften the frosting
Scoop the colored frosting into their own disposable piping bag
Decorating the cake :
Cut the tip off the pink piping bag and pipe drips around the top of the cake
Cut the tip off the red piping bag and pipe over the pink drips
Repeat the same with the yellow piping bag
Using the large piping bag, pipe white dollops around the top of the cake
Sprinkle some jelly beans onto the frosting and place jelly beans around the bottom of the cake
Cut and enjoy!