• 2 ¼ cups unsalted butter 4 ½ sticks
• 4 ½ cup granulated sugar
• 6 cup cake flour
• 2 tsp baking powder
• ½ tsp salt
• 9 large eggs
• 3 cups whole milk
• 2 tsp vanilla extract

Buttercream frosting for icing the cake

• 6 cup unsalted butter room temperature
• 12 cups powdered sugar sifted
• 6 tsp vanilla extract
• 1 1/2 tbsp whole milk

Buttercream frosting for decorating the cake

• 3 cups unsalted butter room temperature
• 6 cups powdered sugar sifted
• ¾ cups whole milk
• 3 tsp vanilla extract
• food coloring purple, pink, dark purple, blue, and black