In a medium bowl, stir together flour, baking powder, baking soda and salt.
In a large bowl, beat butter until light and fluffy. Slowly add brown sugar and then beat additional 2 minutes. Beat in banana, applesauce, eggs and vanilla, just until combined.
Stir in flour mixture.
Stir in oats and chocolate chunks.
Drop by heaping teaspoonfuls onto a baking sheet lined with parchment paper or silicone baking mat.
Bake 8 to 10 minutes or until lightly browned. Cool for one minute before moving to wire rack to cool completely.
Notes
When made to the yield designated in this recipe, each cookie = 2 Weight Watchers Plus Points