Preheat the oven to 350°. Grease a 10-inch oven-safe skillet with butter

In a large bowl, whisk the flour with the baking soda and salt. Set aside.

In another large bowl, mix the butter with the brown sugar and sugar until well combined (the sugar should look slightly dissolved). Add the eggs one at a time, mixing until well combined before adding the next egg and the vanilla extract.

Add the dry ingredients to the wet ingredients and mix until just combined. Fold in the chocolate chips.

Press the dough into the prepared skillet and bake until golden brown and baked through, 30 to 40 minutes. Let cool 15 minutes before cutting and serving.