Deep Dish Skillet Brookie

Name: Deep Dish Skillet Brookie
Cook time: 53 min
Total time: 53 min
Cuisine: American
Ingredients: 6 oz butter (melted); 4 oz butter (softened); 1 ¼ cup sugar; 3 eggs; 2 tsp vanilla; 4 oz chocolate bar; ¾ cup flour; ¼ cup cocoa powder; 1 tsp salt; 1 pack cookie mix; ¼ chocolate chips