Preheat oven to 350 degrees and spray 3 9inch baking pans with pam bakings spray

Using a medium bowl, whisk together the flour, baking powder, cinnamon and salt until combined

Using a standing mixer, beat together the butter and sugar until combined and fluffy

Beat in the eggs, one at a time

Beat in the vanilla

Alternate between the dry ingredients and buttermilk. Gradually mix in both ingredients until combined

Divide the batter between the 3 cake pans

Bake for 30 minutes or until a toothpick comes out clean

Allow to cool completely

Using a standing mixer, beat together all ingredients except the cereal

Beat frosting ingredients until smooth and fluffy

Remove cakes from cake pans and cake off the domes from the cakes to make an even round cake layer

Place one cake layer onto the cake board

Scoop 1 C of the frosting onto the top of the cake layer and spread evenly

Sprinkle 1 C crushed cinnamon toast crunch cereal onto the top of the first layer of frosting

Place the second cake layer on top of the first

Spread evenly another C of frosting

Sprinkle 1 C of crushed cereal on top

Place the last layer of cake on top of the second layer

Scoop 1 C frosting into piping bag and set aside

Using remaining cake layer, frost entire cake

Coat the bottom of the cake in the crushed cereal

Using the piping bag, pipe dollops of the frosting on top

Sprinkle some crushed cereal on top

Cut into slices and enjoy!