I created this recipe by combining the Splenda website's banana bread recipe with a sour cream banana bread recipe on allrecipes.com, and making a few adjustments of my own (whole wheat, yogurt in place of sour cream). They are as low calorie as you can make them, I think, but ooh still so good.
Preheat oven to 300 degrees F (150 C). Grease four 7 x 3 inch loaf pans. (I used cooking oil spray.
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In a large bowl, cream Smart Balance margarine and 3 cups Splenda granulated sugar substitute. I used a fork since the mixer would have blown the lightweight Splenda everywhere. Then mix in the egg whites, mashed bananas, plain yogurt, vanilla, and cinnamon. Use a mixer to mix all that and then mix in salt, baking soda and flour, stirring with a wooden spoon. I had to use some firmer bananas since I didn''t have enough ripe ones, so to get all the lumps out I used a blender to mash the banan
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Divide into prepared pans and bake for one hour, until a toothpick inserted comes out clean.