Preheat the oven 350°F. Line a standard size muffin tin with muffin liners. Generously spray the liners with cooking spray.
Add the eggs to a large bowl. Whisk until well scrambled. Add the Nutella to the bowl with the eggs. Whisk until well combined.*
Divide the batter between the 12 muffin cups (cups will be less than half full).
Bake for 22-24 minutes. Cool completely before serving.**
Video
Notes
*Batter is thick and hard to mix. I use a butter knife to occasionally clean the nutella out of the center of my whisk to ensure that all the nutella gets evenly mixed with the eggs. You could make the nutella easier to mix by warming it. Place the nutella in a microwave safe bowl and heat for 15 seconds at a time until the nutella is soft and easy to stir. However, don't let it get too warm or it will cook the eggs when they are added.**If these brownies are warm, they are harder to get out of the muffin liners and have a more cake-like consistency instead of being chewy.