Preheat your oven to 350 degrees. Grease a 10.25 inch cast iron skillet with butter.
1 tablespoon butter
In a large bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside.
1 1/2 cups all purpose flour, 1/2 teaspoon baking soda, 1/2 teaspoon baking powder, 1/4 teaspoon salt
Beat together the butter, brown sugar and granulated sugar until light and fluffy. About 3 to 6 minutes. Add in the egg and egg yolk, one at a time. Then beat in the vanilla until just combined.
3/4 cup butter, 1/4 cup granulated sugar, 1 egg, 1 egg yollk, 1 1/2 teaspoons vanilla extract, 3/4 cup brown sugar
Add in the dry ingredients. Set the mixer to low and as soon as the flour has just begun to incorporate, turn the mixer on high. (Read why here.) Stir in the chocolate chips.
1 cup chocolate chips
Press the dough into the cast iron skillet and bake for 18 to 20 minutes or until the edges of the pizookie just begins to turn golden brown and the middle has just a slight wiggle to it.
Serve warm in the cast iron skillet with ice cream and hot fudge.