Preheat the oven to 350F, and line a 9x9 baking pan with parchment paper.

In a medium bowl, whisk together the Nutella, flour, eggs, and salt until a thick dough forms.

Spread the brownie into the prepared pan, and bake for 20-25 min, until a toothpick inserted in the center comes out clean.

Let cool slightly and enjoy!