INGREDIENTS
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1 1/2 sticks (12 tablespoons) unsalted butter, melted and cooled, plus more for the pan
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1 1/2 cups all-purpose flour
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1 teaspoon baking powder
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1/2 teaspoon kosher salt
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1 1/2 cups packed dark brown sugar
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1 tablespoon vanilla extract
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2 large eggs, lightly beaten
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1/2 cup toasted walnuts, coarsely chopped
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1 cup plus 2 tablespoons bittersweet chocolate chips
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Flaky sea salt, to garnish