In a medium bowl add the flour, salt and baking powder and set aside. Cream the butter and sugar. Add the egg and vanilla extract and mix.
Add the flour mixture and mix just until combined.
Fold in the chocolate chips and chunks. You don’t want to add the chocolate while you are mixing with a hand mixer or stand mixer because it will break up the chocolate pieces.
We tested this in an 8 inch cast iron pan but you can use whatever size dish you have. Remember the cooking time will be different. Press the cookie dough in the pan until it fills the pan ¾ of the way up. Bake at 350 degrees for 30-33 minutes on the bottom rack of your oven. The center will be slightly gooey and super delicious.