Notes: The oil will help hold the parchment paper in place, so it won't wiggle around.
Notes: Use a whisk to mix until smooth, breaking up any clumps.
Notes: Baking takes about 28 to 30 minutes for two 6-inch pans, and 35 to 38 minutes for one 8-inch pan. Start watching the cake about 5 minutes earlier, as oven temperatures can vary.
Notes: This cake is very moist, so store it tightly covered in the fridge for up to 5 days. It is recommended to bring it to room temperature for at least 1 hour before serving.