1 stick of butter, softened
1 cup tightly packed dark brown sugar
1 large egg
1 cup all purpose flour
1/4 tsp baking powder
1/8 tsp baking soda
1/4 tsp salt
1 cup chocolate chips
1/2 cup chopped hazelnuts
6 tsp Nutella
Cut butter into brown sugar. Beat in the egg.
Add the flour, baking soda, baking powder, salt, chocolate chips and hazelnuts. Stir to combine.
Spread into an 11 x 7 greased and floured cake pan.
Place six tsp of Nutella evenly over top of cookie dough and use a toothpick or fork to swirl.
Place into a 350 degree oven for 20-25 minutes until done.
Allow to cool completely before cutting into squares.