Boil water with Cinnamon sticks and let steep about 1 hour. (Aka let the sticks sit in the water so that it takes in the flavor). This is important so that you can remove the sticks and not bite them
Add salt and oatmeal to boil. Lower heat and simmer for 30 min, stirring often. Add condensed milk slowly and to taste. Be careful it will sweeten strongly. Simmer for 15 minutes.
Scoop into bowl and add milk to thin. Sprinkle cinnamon on top. Serve hot.