Preheat the oven to 350°F. Line a baking sheet with parchment and set it aside.
Combine the softened butter and both sugars in a large mixing bowl. Use an electric mixer to cream the ingredients together until smooth.
Whisk in the egg for 1-2 minutes, then add the flour, baking powder, and baking soda. Whisk until there are no more pockets of dry ingredients in the batter.
Stir in the Nutella and then use a medium cookie scoop to drop 8 balls of dough onto a baking sheet. (Cookies will spread, so space a bit more than usual.) Roll each ball of cookie dough in the chopped hazelnuts. Bake cookies for 11 minutes.
Let your cookies cool on the pan for 5 minutes and then move them to a wire cooling rack. Enjoy!
Notes
These hazelnut cookies will stay fresh for up to 5 days if stored in an airtight container at room temperature.Place them in an airtight container or freezer bag and freeze for up to 3 months. Thaw at room temperature before serving.