Preheat the oven to 350 degrees. Spray an 8x8 inch non-stick cake pan with spray.
In a medium mixing bowl, using a sturdy whisk or spatula, mix the applesauce, vanilla, egg whites and sugar until they are well combined.
Add the flour, cocoa powder, espresso powder, baking powder, and salt. Stir the mixture until it is just combined and no lumps remain. Pour it into the prepared pan. Sprinkle the chips evenly over the top. Bake the brownies for 20-22 minutes or until a toothpick inserted in the center comes out dry (a few crumbs are okay).
Transfer the pan to a cooling rack and allow them to cool 5 minutes. Cut into 12 equal brownies. Makes 12 (1 brownie) servings.