7-1/2 cups all-purpose flour
2 tablespoons and 1-1/2 teaspoons baking powder
1-1/4 teaspoons baking soda
1/2 teaspoon salt
10 egg whites

5 cups mashed bananas
3-3/4 cups white sugar
3/4 cup and 3 tablespoons vegetable oil
1 tablespoon and 2 teaspoons lemon zest
1-3/4 cups and 1 tablespoon chopped walnuts

7 -1/2 cups all-purpose flour 2 tablespoons and 1-1/2 teaspoons baking powder 1 -1/4 teaspoons baking soda 1/2 teaspoon salt 10 egg whites 5 cup s mashed bananas 3 -3/4 cups white sugar 3/4 cup and 3 tablespoons vegetable oil 1 tablespoon and 2 teaspoons lemon zest 1 -3/4 cups and 1 tablespoon chopped walnuts

Preheat oven to 350 degrees F (175 degrees C). Spray muffin tins with non-stick cooking spray.
In large bowl, stir together flour, baking powder, soda, and salt.
In a medium bowl, beat egg whites slightly. Stir in bananas, sugar, oil, and lemon peel. Add to flour mixture, stirring just until combined. Stir in walnuts. Fill muffin pan cups 2/3 full.
Bake for about 20 to 25 minutes, or until tops are lightly browned. Remove muffins from pan.