Super-Moist Chocolate Cake with Chocolate Buttercream Frosting

"Can you really go wrong with this Old School Super-Moist Chocolate Cake with Chocolate Buttercream Frosting for any occasion? You’ll want to serve this up, trust me! Besides, there’s a secret in this chocolate cake that makes it super-ultra-moist. Can you try to guess what it is? Mayonnaise! Yes, I really said ‘Mayonnaise’! If you don’t like mayonnaise, you can rest assured, you will not taste the mayonnaise at all. It’s just there to bring in that super-moist ‘super power’ factor that we all love and adore. The chocolate buttercream…OH EM GEE! Perfect pairing with this cake!"