Yellow Butter Cake with Chocolate Buttercream

Bahan-bahan (24 porsi)

• 4 cups all purpose flour
• 2½ teaspoons baking powder
• 2 teaspoons salt
• ¼ teaspoon baking soda
• 1¼ cups (2½ sticks) unsalted butter, (at room temperature)
• 2 tablespoons canola or vegetable oil
• 2 cups granulated white sugar
• 2 large eggs, (at room temperature)
• 4 large egg yolks, (at room temperature)
• 4 teaspoons vanilla extract
• 1⅔ cups buttermilk, (at room temperature)
• 1 cup (2 sticks) salted butter, (at room temperature)
• 6 ounces cream cheese, (at room temperature)
• 2 pounds powdered sugar, (sifted)
• 2 tablespoons unsweetened cocoa powder
• ½ cup milk
• 1 teaspoon vanilla extract
• 2 cups dark chocolate chips ((or chopped dark chocolate))