Preheat the oven to 350 degrees. Spray a 9×13 baking dish with cooking spray and set aside.

Melt butter in a saucepan over low heat. Stir in sugar and stirring constantly for about 2 more minutes {do NOT bring to a boil}. Stir in Nutella and remove from heat.

In a stand mixer, beat Nutella mix with the cocoa powder, eggs, salt, baking powder, and vanilla extract. Mix until well combined. Add the flour and chocolate chips and mix until incorporated.

Spread dough evenly into prepared pan, and bake until toothpick inserted comes out clean, about 30 minutes. Cool before serving.