Preheat your oven to 350°F and line a baking sheet with parchment paper.

In a large bowl, combine the Nutella, all-purpose flour, salt, and egg. Stir until a smooth dough forms.

Place the dough balls on the prepared baking sheet, spacing them about 2 inches apart.

Gently press down on each dough ball to flatten it slightly.

Bake the cookies in the preheated oven for 9 minutes or until the edges are set.

Remove the baking sheet from the oven and let the cookies cool on the sheet for 5 minutes. Then transfer them to a wire rack to cool completely.