Prepare & Bake the Cake:

• Preheat oven to 350°F (180°C). Grease three 9-inch cake pans with butter and dust with flour.
• In a large bowl, cream butter and sugar with an electric mixer on medium speed. Add eggs one at a time, mixing well. Stir in vanilla extract.
• In a separate bowl, sift together flour, baking powder, baking soda, and salt.
• Gradually fold dry ingredients into the wet mixture, alternating with buttermilk. Do not overmix.
• Divide batter evenly into three bowls. Add pink, blue, and yellow food coloring separately to each bowl and mix gently.
• Pour into prepared cake pans and bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
• Let cakes cool in pans for 10 minutes, then transfer to a wire rack to cool completely.

Make the Buttercream:

• In a large bowl, beat butter with an electric mixer until creamy.
• Gradually add powdered sugar, about ½ cup at a time, mixing well.
• Stir in vanilla extract, salt, and heavy cream. Mix on low speed until smooth.
• Transfer ¼ of the frosting into a piping bag with a large round tip.

Assemble the Cake:

• Spread a small amount of buttercream on a cake stand and place the blue cake on top.
• Pipe a layer of buttercream over the blue cake and smooth it with a spatula.
• Repeat with the yellow cake, then the pink cake.
• Apply a thin crumb coat of frosting around the sides and chill for 20 minutes in the freezer (or 40 minutes in the fridge).
• Frost the cake with a final smooth layer of buttercream.

Decorate:

• Arrange Bunny Peeps around the cake, alternating colors.
• Pipe swirls of buttercream along the top edge.
• Sprinkle green coconut in the center and top with M&M’s.