Cookies: Preheat oven to 350 degrees Fahrenheit.
Mix eggs, sugar, salt, vanilla, hot coffee, and vegetable oil. Then add flour, cocoa, baking powder and baking soda. Mix all together, drop on cookie sheets and bake for 5 minutes.
Filling: Beat eggs. Add the rest of the ingredients. Beat well.
Assemble whoopie pies by spreading the filling between 2 cookies.
Recipe courtesy of Katie Beiler, Amish Market, Annapolis, MD