Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 3/4 cup Dutch process cocoa
• 2 tsp baking soda
• 1 tsp baking powder
• 1 tsp salt
• 1 cup stout
• 1 tbsp espresso powder
• 1 cup mayonnaise
• 1 cup hot water
• 2 large eggs
• 1 cup dark chocolate chunks
• 1 cup unsalted butter, softened
• 4 cups powdered sugar
• 1/2 cup whole milk