Sift flour baking powder baking soda and salt into a large bowl and whisk with a metal whisk until well blended
In a large bowl blend the egg whites oil brown sugar vanilla and mashed bananas with an electric mixer until creamy
Add dry ingredients to wet and with a few swift strokes blend by hand until smooth
Pour into non-stick loaf pans sprayed with cooking oil and bake for 50-60 minutes or until a toothpick or cake tester inserted into the center of the loaf comes out clean