In a large jar (one that holds at lease 2 1/2 cups of stuff and has a lid). mash the banana with a fork (smoothish with a few chunks) then mix in the coffee, milk, maple(if using) and cinnamon. Now mix in the oats. Place lid on jar and stick it into the fridge overnight (6-8 hours)
When ready to eat, grab a spoon and go to town. You might like adding another pinch of cinnamon, maybe a few walnuts, or even a scoop of nut butter. Chocolate chips are welcome as well.
Drinking a cup of coffee while eating this is not discouraged.