Guinness Chocolate Cake with Irish Buttercream Wednesday, March 25, 2020 Edit Guinness Chocolate Cake with Irish Buttercream features an easy, fudgy, and moist cocoa cake with Guinness beer and thick creamy and sweet Irish cream buttercream. The perfect St. Patrick’s Day cake! Please visit Guinness Chocolate Cake with Irish Buttercream for full recipes. Share this post