Prep Time 25 minutes mins
Cook Time 30 minutes mins
Resting Time 2 hours hrs
Total Time 2 hours hrs 55 minutes mins
For the most vibrant color and tender crumb, use natural cocoa and avoid overmixing once the dry and wet ingredients meet. If your pudding seems loose, chill it longer or whisk in 1 to 2 tablespoons of instant pudding mix to firm it up before filling. To prevent the filling from oozing out, maintain that 1-inch border and avoid overfilling, and consider piping a frosting dam around the edge before adding the pudding. Buttermilk should be at room temperature to prevent the batter from tightening, and parchment circles ensure clean release. The cake tastes best after a short chill to set the filling, and leftovers keep well covered in the refrigerator for up to 3 days; bring slices to room temperature for the softest texture.