April Andersons Rainbow Cake

Ingredients

• 3 sticks (12 ounces) unsalted butter
• 9 large eggs
• 3 large egg yolks
• 1 1/2 cups sour cream
• Cooking spray
• 4 1/2 cups cake flour
• 1 1/2 teaspoons baking powder
• 3/4 teaspoons kosher salt
• 3 3/4 cups granulated sugar
• 2 cups plus 2 tablespoons canola oil
• 1 1/2 tablespoons vanilla extract
• 1 to 3 tablespoons each red, blue, yellow, green, purple, and orange food coloring
• Rainbow sprinkles, for decorating (optional)
• 2 (8-ounce) packages full-fat cream cheese
• 2 sticks (8 ounces) unsalted butter
• 6 cups powdered sugar, plus more as needed
• 2 teaspoons vanilla extract
• 1/4 teaspoon kosher salt

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