Preheat your oven to 350°F (175°C).
Grease a 9x9 inch baking pan or line it with parchment paper.
In a mixing bowl, combine Nutella and eggs.
Whisk the mixture until smooth.
Add flour, salt, and baking powder; stir until just combined.
Fold in chocolate chips if using.
Pour batter into the prepared pan and spread evenly.
Bake for 20-25 minutes until a toothpick comes out with moist crumbs.
Allow cooling before slicing into squares.