For the Best St. Patrick's Day, You Can Drink Your Guinness and Eat It Too (As Cake!)

Ingredients (21)

• Unsalted butter, for greasing the pan
• 1 cup (240 ml) Guinness Extra Stout Beer (see notes)
• 2 1/4 ounces unsweetened natural cocoa powder (65 g; 3/4 cup), plus more for pan
• 7 3/4 ounces all-purpose flour (224 g; 1 3/4 cups)
• 10 1/2 ounces granulated sugar (300 g; 1 1/2 cups)
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume
• 2 large eggs
• 1 cup (240 ml) whole milk
• 1/2 cup (120 ml) vegetable oil
• 2 teaspoons vanilla extract
• 1 cup (240 ml) Guinness Extra Stout Beer
• 3 1/2 ounces granulated sugar (100 g; 1/2 cup)
• 1/2 teaspoon instant espresso powder
• 4 ounces (113 g) cream cheese, softened
• 5 1/4 ounces granulated sugar (150 g; 3/4 cup)
• 3/4 ounces malted milk powder (22 g; 2 tablespoons)
• 2 1/2 cups (591 ml) heavy cream
• 1 teaspoon vanilla extract
• 1/2 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume