Wash, peel, and slice the banana.

In a saucepan, place the milk, oat flakes, chia seeds, and some water (about ½ cup). Bring to a boil, stirring occasionally. Then reduce the heat and cook for about 5-10 minutes, depending on the desired consistency of the oatmeal. Stir occasionally. Add more water if necessary.

Transfer to a plate and add the banana slices.