Preheat the oven to 350°F. Line 2 cookie sheets with parchment paper.
In a large bowl combine the nutella, flour and egg. Mix until well combined.
Use a cookie scoop to scoop even balls of dough onto the prepared cookie sheets, about 1 inch apart.
Bake in the preheated oven for 10-12 minutes. Remove the cookies from the oven and let them sit for 5 minutes. Then press 1 Hershey's kiss into the center of each cookie. Remove from cookie sheets to cooling rack.