Put the banana in a deep plate, mash it with a fork and sprinkle with the oat flakes.
Now pour in the desired amount of milk (I always pour up to the rim of the plate because I prefer it a little more liquid. The porridge thickens a little when heated. However, you can take a little less liquid first and then dilute it). Stir everything well again with a fork and mash so that the starch comes out of the oat flakes. Cover and heat in the microwave for 1 minute at full power.
Now stir in the spices and salt. The salt can only be added now, otherwise the oatmeal will not soften as well. If necessary, dilute with a little milk. Heat again in the microwave for about 30 seconds.