Preheat the oven to 350 degrees F. Line two cookie sheets with parchment paper.
In a small sauce pan, melt the butter over medium heat. In a large mixing bowl, combine the butter, coconut sugar, salt, and egg. Mix with beaters until combined.
Add the remaining ingredients except for the shredded carrots. Stir until combined. Fold in the shredded carrots.
Using a cookie scoop, places scoops of the batter onto the cookie sheets. Place the cookies about 2 inches apart. Bake for 8-9 minutes. Cool for 2-3 minutes before moving the cookies to a cooling rack. Allow the cookies to cool completely before making the whoopie pies.
In a medium mixing bowl, combine all of the filling ingredients and beat on high until they are thoroughly combined. Place the cookies in pairs of two. Put a dollop of filling on one cookie and place the other cookie on top. Repeat with the remaining pairs.