Guinness Cupcakes with Bailey's Frosting and Chocolate Drizzle

Ingredients

• 1 cup unsalted butter
• 1 cup Guinness Stout beer
• 1/3 cup cocoa powder
• 1 cup light brown sugar, packed
• 1 tsp salt
• 2 cups all purpose flour
• 1 cup granulated sugar
• 1¼ tsp baking soda
• 2 eggs
• ½ cup sour cream
• ¾ cup unsalted butter, room temperature
• 3 - 3½ cups powdered sugar (depending on your tastes)
• pinch of salt
• 4 Tbsp Bailey's Irish Cream (original - although flavored ones would work as well)
• 2 Tbsp heavy cream
• 1/3 cup Bailey's Irish Cream
• ¼ cup cocoa powder
• ¼ cup light corn syrup
• 1/3 cup semi-sweet chocolate chips