Preheat oven to 350˚F. Spray a 12-cup muffin tin with nonstick cooking spray. You can also line the cups with cupcake liners.

In a medium bowl, whisk together eggs and Nutella in a medium bowl until smooth.

Add flour and stir together, until just combined.

Divide the batter evenly between prepared muffin cups.

Add a few chocolate chips on top of each, if desired.

Bake for 13 to 15 minutes, until the edges are set and the middle is no longer jiggly.

Let rest in the pan for 5 minutes before removing to a wire rack to cool completely.

Dust with powdered sugar before serving, if desired.