3. Add all of the wet ingredients to a separate mixing bowl and whisk together. Then, pour the wet ingredients into the dry and whisk for about 30 seconds, until you have a batter. The batter will be thick—this is normal.
5. Add the berries to the top of the cake and transfer it to the oven. Cook for 35-40 minutes, or until golden across the top. It's best to slightly over-bake rather than under-bake. The middle section of the cake should also have a golden color, not just the edges.