Pre-heat oven at 350 degree F.
Combine wet ingredients - sugar, unsalted butter, egg and vanilla extract, in a medium bowl.
Add flour, baking powder, baking soda, salt and jello mix to the wet mixture and mix well.
Place dough mixture in refrigerator for 30-60 minutes (optional).
Roll dough into 1 1/2-inch balls and place on cookie sheet lined with parchment paper. Dough mixture should yield roughly a dozen cookies. Bake for 10 minutes.
Cool cookies for ~20 minutes on a cooling rack.
Make Nutella icing by combining and mixing well all the Nutella icing ingredients.
Spread about a tablespoon of Nutella icing on each cookie. Serve and enjoy!