Place ½ banana in each mason jar and mash up with a fork. Add 1 cup milk, 1 teaspoon vanilla, ½ tablespoon maple syrup, 1 tablespoon chia seeds, ½ tablespoon peanut butter and a dash or salt to each jar. Close the jars and shake well until ingredients combined. Open the jar and add ½ cup oatmeal to each jar. Place lid on jar and shake again. Refrigerate overnight.
In the morning, open the jar, slice up some banana on top of each jar and enjoy.