Spongy coffee flavored cupcakes join with creamy mascarpone buttercream frosting to make these delicious tiramisu cupcakes! These cupcakes are crafted from my favorite vanilla cupcakes recipe, but with a few tweaks to give them the flavor of lady fingers soaked in coffee. They're topped with a super simple mascarpone buttercream frosting and light dusting of cocoa powder for that classic tiramisu look and feel.