HOW TO MARBLE
With a hit of cocoa powder, one batter can easily become two (see recipe, opposite). Here’s how to combine them
1. Build a Layer
Fill a greased cake pan with the larger proportion of cake batter (in this case, classic vanilla). Using an offset spatula, spread the batter evenly, making sure it reaches and fills the corners (the layer will be thin).
2. Dollop a Second
Using a spoon or stiff spatula, evenly add the second flavor (in this case, chocolate) in small mounds atop the existing layer of cake batter.
3. Swirl Them Together
Insert an offset spatula or butter knife straight down into the batter to the bottom of the pan. Drag in swirling patterns around and across the cake, intermixing the batters, then smooth the top.