Rainbow Buttercream Cake Recipe - Food.com

Ingredients

• 1 cup unsalted butter, at room temperature
• 1 3/4 cups granulated sugar
• 4 large eggs
• 2 teaspoons vanilla extract
• 3 cups cake flour
• 1 tablespoon baking powder
• 3/4 teaspoon salt
• 1 cup heavy cream (33% milk fat)
• 1 cup whole milk (3.25% milk fat)
• 3 cups unsalted butter, at room temperature
• 6 cups icing sugar, sifted
• 3 teaspoons vanilla extract
• 1 pinch salt