Preheat oven to 350 degrees F (176 C) and ready a ramekin for baking with parchment paper or non-stick spray. (I don't use either of those--I bake right within my ramekin, eat straight from it, and wash or soak immediately.)
Mash banana in small/medium mixing bowl. Add water and stir well to combine.
Add ground flaxseed through peanut butter and stir well to combine.
Mix in oats completely. Then add chocolate chips and fold them in.
Put mixture in ramekin and bake for 20-25 minutes. Let cool slightly and enjoy!