1½ cups chocolate chips (or chunks or chopped chocolate)
½ cup Nutella
Scoop Nutella into balls on wax paper and freeze.
Preheat oven to 350 degrees.
In a separate bowl mix flour, baking soda, salt, baking powder. Set aside.
Cream together softened butter and sugars until combined.
Beat in eggs and vanilla until fluffy.
Mix in the dry ingredients until combined.
Add 1½ cups chocolate chunks and mix well.
Spread half of the dough mixture into a 12-inch cast iron skillet. Sprinkle in the nutella, then cover with the remaining dough mixture. Bake for 20 mins, covered in foil, then uncover and bake for an additional 10 minutes. (The baking time will depend on the depth of your skillet. If you are using a 10-inch, it will cook longer than if you are using a 12 inch. Watch for the sides to get golden brown and slightly crispy)