Place the Nutella and eggs in a medium bowl and whisk until smooth and well blended. Add the flour and whisk until blended.
Pour batter into a 9 x 9 baking pan lined with parchment paper.
Bake about 10-12 minutes until a knife inserted comes out almost clean with just a few crumbs clinging.
Notes
The recipe is adapted from Desserts 4 Today: Flavorful Desserts with Just Four Ingredients by Abby Dodge.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.