– 1 cup all-purpose flour – 1/3 cup dutch cocoa powder – 1/4 teaspoon salt – 1 teaspoon baking powder – 1/3 cup unsalted butter melted – 1/2 cup golden brown sugar – 1/2 cup granulated sugar – 1 large egg + 1 egg yolk at room temp – 1 teaspoon vanilla extract – 1 cup semisweet chocolate chips