5) Using a tablespoon sized cookie scoop, place scoops of batter approximately 2 inches apart on the cookie sheets. You can bake right away for higher domed cakes, or let sit 5 minutes for wider cakes. Bake the cakes for 10-14 minutes or until a cake tester inserted in the center comes out clean and the cakes are springy to the touch.
In a large bowl mix all filling ingredients together until light and fluff. Scrape the bowl often to avoid lumps.
To assemble, spread one half of the cooled cakes with the filling, and the other half with 2 teaspoons of your favorite berry jam. You can also use fresh berries for extra flavor. Place halves together and press gently to spread filling to edges. Whoopie Pies can be stored at room temperature for 2-3 days, but usually don't last that long.