Basic Buttermilk Quick Bread  Makes one loaf    2 cups (10 oz) all-purpose flour  1/2 cup (4 oz) white sugar  1 1/2 teaspoons baking powder  1/2 teaspoon baking soda  1 teaspoon salt  1 cup (8 oz) buttermilk  1 large egg  1/4 cup (2 oz) unsalted butter, olive oil, or vegetable oil
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