Preparation / Directions:
Preheat oven to 400 degrees F. In a large mixing bowl, combine flour, sugar, baking powder, salt , and baking soda. Cut in butter with a pastry blender until the mixture resembles coarse meal. Set aside.
In a medium bowl, mix buttermilk, vanilla, egg whites and banana. Add wet mixture to dry mixture just until combined. Mix in chocolate chips.
Turn dough out on a lightly floured surface. Knead lightly. Spray a large cookie sheet with vegetable cooking spray. Pat the dough into a 9-inch circle on the cookie sheet. Sprinkle the walnuts and brown sugar over the dough, pressing gently into the dough. Cut the dough into 12 slices. bake for 20 minutes.
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