One Bowl Chocolate Sheet Cake with Milk Chocolate Fudge Frosting

Bahan-bahan (16 porsi)

• 2 eggs
• 3/4 cup buttermilk
• 1/4 cup plain greek yogurt
• 1/2 cup canola oil
• 1 tablespoon vanilla extract
• 1 1/2 cups all-purpose flour
• 1 1/2 cups granulated sugar
• 1 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 3/4 cup hot black coffee
• 1/2 cup semi-sweet chocolate chips ((optional))
• 2 sticks (1 cup) salted butter, softened to room temperature
• 1 1/2 cups powdered sugar
• 8 ounces milk chocolate, melted and cool to touch
• 2 teaspoons vanilla extract
• 2 -3 tablespoons heavy whipping cream ((optional))