Big Bad Brookie

Preheat oven to 350 degrees F and butter a 12 ” cast-iron skillet. In a large mixing bowl, cream butter and sugars until combined and fluffy, 2 minutes. Add eggs and vanilla and mix until combined. Stir in baking soda, salt, and flour. Add chocolate chips. In a second large bowl, whisk together brownie mix and flour. Stir in eggs and melted butter until combined. Transfer chocolate chip cookie dough to skillet and form the yin of a yin yang, using your hands to shape the dough. Add brownie dough and shape the yang. Using a small biscuit or cookie cutter, cut a hole in each and swap the doughs. Bake until golden, 25 minutes, then let cool slightly in skillet. Serve slices with a scoop of vanilla ice cream and drizzle with chocolate syrup.