Ingredients 4 cups (460 grams) sifted all-purpose flour 1 cup (200 grams) white granulated sugar 4 teaspoons baking powder 1 teaspoon salt Zest of one orange or lemon (optional) 1 large egg, lightly beaten 1/4 cup (4 tablespoons) (56 grams) unsalted butter, melted and cooled