Preheat the oven to 350 degrees.
In a mixing bowl, mix together the Nutella and egg until thoroughly combined. Slowly add the flour and mix until incorporated.
On a baking sheet lined with parchment paper, drop tablespoon-sized balls of batter onto the baking sheet. Leave about 1-1 ½ inches of space between each drop of batter.
Bake for 10-12 minutes and place on a rack to cool.