Mother's Day Cake

Ingredients

• 1 cup unsalted butter 226g or 2 sticks
• 2 cups granulated sugar
• 1 cup egg whites
• 1 cup whole milk
• 2 teaspoons vanilla extract
• 1 1/2 cups all purpose flour
• 1 1/2 cups cake flour
• 1 tablespoon baking powder
• 1/2 teaspoon salt
• 1/2 cup butter softened
• 3 cups confectioners sugar
• 1/2 cup cocoa
• 1/3 cup milk
• 2 teaspoons vanilla
• 1 cup butter 226g or 2 sticks, softened
• 8 cups confectioners sugar
• 1 tablespoon vanilla
• 1/4 cup milk
• 1 dash salt