Oh boy. This is decadence right here. A chocolate cake with a melty peanut butter center. This is the good stuff. If you or your Valentine...or your mom or your neighbor or your mail lady...is a fan of peanut butter and chocolate, put these cakes on your must-make list immediately. Lava cakes seem like they're complicated to make. (Pssst...they're not.) Here's a red velvet lava cake you might want to try, too! You'll make the cake batter as well as peanut butter centers.