Cup of Yum
1. Preheat the oven to 350 degrees and spray the 3 cake pans with pam baking spray.
2. Combine all cake ingredients into a standing mixer or large mixing bowl and beat until combined.
3. Divide the batter between the 3 pans and bake in the oven for 28-32 minutes or until a toothpick comes out clean.
4. Allow to cool completely before moving onto the cake board.
5. Using a cake leveler, remove the dome from the cakes to make even.
6. Using a standing mixer, beat together the butter, powdered sugar, vanilla, and heavy whipping cream until combined, smooth and stiff with peaks.
7. Scoop 1/2 C of frosting into 4 bowls.
8. Mix in a few drops of a color into 1 bowl. Repeat steps for remaining colors.

Building the cake directions

Cup of Yum
1. Using 1 cake layer on the cake board, scoop 1 C of frosting onto the top of the cake and spread evenly.
2. Sprinkle ¾ C of lucky charm cereal all over the frosting layer.
3. Place the second layer of cake on top of the first layer of cereal frosting.
4. Scoop another 1 C of frosting onto the second layer of cake and spread evenly.
5. Sprinkle another ¾ C of lucky charms.
6. Place the last layer of cake on top.
7. Frost entire cake with the remaining white frosting.
8. Scoop ¼ C of each colored frosting into their own bags, set aside.
9. Using a knife, blot dollops of the colored frosting all over the side of the cake.
10. Take a flat spatula and lightly spread the colored frosting to create a rainbow effect.
11. Pick out the marshmallows from the cereal and place the randomly on the sides of the cake.
12. Using the colored frosting, pipe dollops of the frosting on top.
13. Fill the center of the cake with Lucky Charm cereal.
14. Cut and enjoy!