Traditional Whoopie Pie Recipe. Line two large baking sheets with parchment paper. Make the cakes.
Sift flour cocoa powder espresso powder baking soda and salt together into a medium bowl. Drop the dough onto the baking sheets in 30g balls about the size of a large ping pong ball or about 1 14. Bake for 11 to 12 minutes until set.
Preheat oven to 350 degrees F.
Sift together flour cocoa powder baking soda and salt. Bake for 11 to 12 minutes until set. Preheat oven to 350F180C. Add egg and beat for an additional minute then scrape sides.