Frosted Guinness Brownies – Simmer + Sauce

Ingredients

• For the Brownies:
• One (12-ounce bottle) Guinness Extra Stout
• 1/2 cup unsalted butter
• 1 cup semi-sweet chocolate chunks
• 1 cup sugar
• 2 teaspoons vanilla extract
• 2 eggs
• 1/2 cup all-purpose flour
• 1/4 cup unsweetened cocoa powder
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• For the Frosting:
• 6 tablespoons unsalted butter, at room temperature
• 1/8 teaspoon salt
• 1 1/4 cups Confectioners' sugar
• 1/2 teaspoon vanilla extract
• 3-5 tablespoons milk
• Chocolate shavings, for garnish (optional)