Sift flour, baking soda, baking powder and salt into a bowl. Set aside.
Cream butter and sugars together until very fluffy. Add egg. Stir in the vanilla. Stir in ingredients and mix until just combined. Mix in chocolate chips.
Preheat oven to 350 degrees.
Pat cookie dough into 8" cast iron skillet. Optional: Sprinke with a small handful of chocolate chips. Press chocolate chips down into dough.
Bake 30 minutes or until cookie is golden brown. Let sit 10-15 minutes before eating.