This is from BHG's New Dieter's cookbook- I get so many compliments on how moist it is:

Ingredients
1-1/2 cups all-purpose flour
1-1/4 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon ground cinnamon
1/8 teaspoon salt
2 slightly beaten egg whites
1 cup mashed banana
3/4 cup sugar
1/4 cup cooking oil
Nonstick cooking spray
Directions
1. In a medium mixing bowl stir together flour, baking powder, baking soda, cinnamon, and salt.

2. In a large mixing bowl stir together egg whites, banana, sugar, and oil. Stir flour mixture into banana mixture just until moistened.

3. Spray an 8x4x2-inch loaf pan with nonstick cooking spray. Spread batter in prepared pan. Bake in a 350 degree F oven for 45 to 50 minutes or until a toothpick inserted near the center comes out clean.

4. Cool bread in the pan for 10 minutes. Remove from pan and cool thoroughly on a wire rack. For easier slicing, wrap the bread in plastic wrap and store overnight. Makes 1 loaf (16 servings).

5. Make ahead directions: Cool completely. Wrap in foil, then seal in a plastic bag. Freeze up to 3 months.

Nutrition Facts
Servings Per Recipe 1 loaf (16 servings) Calories 130, Total Fat (g) 4, Saturated Fat (g) 1, Cholesterol (mg) 0, Sodium (mg) 96, Carbohydrate (g) 23, Fiber (g) 1, Protein (g) 2, Vitamin C (DV%) 4, Calcium (DV%) 3, Iron (DV%) 4, Percent Daily Values are based on a 2,000 calorie diet