Chocolate Cake Mocha Icing

Ingredients

• 1 3/4 cups all-purpose flour
• 2 cups granulated sugar
• 3/4 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 2 eggs
• 1 cup whole milk
• 1/2 cup vegetable oil
• 2 teaspoons pure vanilla extract
• 1 cup boiling water
• 1/2 cup unsalted butter, softened
• 2 cups powdered sugar
• 2 tablespoons unsweetened cocoa powder
• 2 tablespoons brewed coffee, cooled
• 1 teaspoon vanilla extract