-
Preheat oven to 350.
-
Lightly spoon flour into a dry measuring cup; level with a knife.
-
Combine flour, sugar, baking soda, and salt in a large bowl.
-
Make a well in the center of the mixture.
-
Combine the buttermilk, butter and egg whites, stirring with a whisk.
-
Add wet mixture to the flour mixture and stir until just moist.
-
Spread batter into an 8 x 4 inch loaf pan coated with cooking spray.
-
Bake at 350 for 45 minutes or until a pick inserted in the center comes out clean.
-
Cool 10 minutes in the pan on a wire rack; remove from pan. Cool completely on a wire rack.