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