Whole Wheat Chocolate Chip Skillet Cookie

INGREDIENTS

• 3 cups / 13.5 oz / 380 g whole-wheat flour
• 1 1/2 teaspoon baking powder
• 1 teaspoon baking soda
• 1 1/4 teaspoon fine grain sea salt
• 8 ounces / 225 g (2 sticks) cold unsalted butter, cut into 1/2-inch pieces, plus more for buttering the pan
• 1 cup / 5 oz / 140 g dark brown sugar
• 1 cup / 7 oz / 200 g sugar
• 2 large eggs
• 2 teaspoons pure vanilla extract
• 8 ounces / 225 g bittersweet chocolate, roughly chopped into 1/4- and 1/2-inch pieces