INGREDIENTS
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1 2/3 cups all-purpose flour 1/2 cup unsweetened cocoa powder 1/2 teaspoons baking soda 1/4 teaspoon salt 1 1/2 sticks (12 tablespoons) of unsalted butter, melted and cooled 1 cup loosely brown sugar 1/2 cup granulated sugar 1 egg + 1 egg yolk, at ro