Mix together whoopie pie ingredients in a food processor until combined and drop 3 tablespoons not a lined baking sheet leaving 2 inches between each pie. Form into a circe ad bake for 15-18 minutes or until set.
While cookies are baking, beat together frosting ingredients until whipped.
After cookies have cooled, add frosting to a piping bad and add to half of the cookies. Top with remaining cookies. Dip into sugar-free red, white and blue sprinkles (optional).