Yellow Birthday Cake With Fluffy Chocolate Ganache Frosting

Ingredients

• 1 1/2 cups (3 sticks) unsalted butter, at room temperature
• 2 cups sugar
• 3 eggs
• 3 egg yolks
• 1 teaspoon vanilla extract
• 3 cups cake flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 1 cup nonfat buttermilk
• fluffy chocolate ganache frosting
• 12 ounces semisweet chocolate, finely chopped
• 1 cup heavy cream
• 1 cup (2 sticks) unsalted butter, at room temperature
• 1 cup confectioners’ sugar
• 1/4 teaspoon kosher salt
• 1/2 teaspoon vanilla extract