Step 1

Preheat the oven to 350 degrees and spray the 3 cake pans with pam baking spray

Step 2

Combine all cake ingredients into a standing mixer or large mixing bowl and beat until combined

Step 3

Divide the batter between the 3 pans and bake in the oven for 28-32 minutes or until a toothpick comes out clean

Step 4

Allow to cool completely before moving onto the cake board

Step 5

Using a cake leveler, remove the dome from the cakes to make even

Step 6

Using a standing mixer, beat together the butter, powdered sugar, vanilla, and heavy whipping cream until combined, smooth and stiff with peaks

Step 7

Scoop 1/2 C of frosting into 4 bowls

Step 8

Mix in a few drops of a color into 1 bowl. Repeat steps for remaining colors

Step 9

Building the cake directions:

Step 10

Using 1 cake layer on the cake board, scoop 1 C of frosting onto the top of the cake and spread evenly

Step 11

Sprinkle ¾ C of lucky charm cereal all over the frosting layer

Step 12

Place the second layer of cake on top of the first layer of cereal frosting. Scoop another 1 C of frosting onto the second layer of cake and spread evenly.

Step 13

Sprinkle another ¾ C of lucky charms

Step 14

Place the last layer of cake on top

Step 15

Frost entire cake with the remaining white frosting

Step 16

Scoop ¼ C of each colored frosting into their own bags, set aside

Step 17

Using a knife, blot dollops of the colored frosting all over the side of the cake

Step 18

Take a flat spatula and lightly spread the colored frosting to create a rainbow effect

Step 19

Pick out the marshmallows from the cereal and place the randomly on the sides of the cake

Step 20

Using the colored frosting, pipe dollops of the frosting on top

Step 21

Fill the center of the cake with Lucky Charm cereal

Step 22

Cut and enjoy!