Moist Yellow Sheet Cake • Kroll's Korner

Ingredients

• 3 1/2 cups cake flour, spooned and leveled
• 2 1/2 tsp. baking powder
• 1/2 tsp. baking soda
• 1 tsp. salt
• 1 cup softened butter or vegetable shortening
• 2 cups granulated sugar
• 2 Tbsp. vegetable oil
• 1 Tbsp. vanilla extract
• 4 large eggs, room temperature
• 2 large egg yolks, room temperature
• 1/2 cup sour cream, full-fat, room temperature
• 1 cup buttermilk, room temperature
• rainbow jimmies, optional
• 1 cup unsalted butter, softened
• 1/2 cup Dutch cocoa, sifted if clumpy
• 3 1/2 cups powdered sugar, sifted
• 1/3 cup heavy cream, room temperature
• 2 tsp. vanilla extract
• 1/2 tsp. espresso powder
• 1/2 tsp. salt