Preheat oven to 350°F

Melt butter in small saucepan over low heat

Stir in sugar, stirring constantly. *Do not let boil*

Remove mixture from heat and stir in Nutella

Beat cocoa powder, eggs, salr, baking powder, espresso powder, and vanilla extract into nutella mixture

Stir in flour and chocolate chips

Bake for 30-35 minutes until tester is mostly clean