Buttermilk Pound Cake
["1 1/2 c. sifted all-purpose flour", "1/4 tsp. baking soda", "1 egg and 2 egg whites", "1 1/4 tsp. vanilla", "1 Tbsp. unsalted butter", "1/4 tsp. baking powder", "3/8 tsp. salt", "1/2 c. low-fat buttermilk", "1/4 c. stick margarine", "1 c. granulated sugar"]
["Have all ingredients at room temperature.", "Adjust oven racks to divide oven in thirds.", "Preheat oven to 325\u00b0.", "Spray a 5-cup loaf pan, Bundt or tube pan with nonstick cooking spray."]
["flour", "baking soda", "egg", "vanilla", "unsalted butter", "baking powder", "salt", "low-fat buttermilk", "margarine", "sugar"]