Guinness Cupcakes with Baileys Buttercream recipe - wonderfully delicious chocolate cupcakes made with Guinness beer and topped with a decadent Baileys Irish Cream frosting. One bite and you will be blown away! Chocolate cake mix, sour cream, chocolate pudding mix, eggs, oil, Guinness beer, butter, powdered sugar, and Baileys liqueur. A must for your St Patrick's Day parties!