Peanut Butter Marble Cake

I made a cake recently, but I wanted to do a little something different with it. I wanted a cross between a sweet cake and a snack cake, so I didn't want to use an icing and piping on it - I wanted something quick and easy. I began with a simple marble cake. The classic flavors of chocolate and vanilla swirl. 

 Then while the cake was still warm, but not hot, I spread smooth peanut butter on top, which melted slightly over the cake. This added another depth of flavor to the profile.  Then I sprinkled chocolate chips over top to add a little more chocolate flavor. Then I stuck the cake in the fridge briefly to allow the topping to set.