- 6 cups water
- 1 cup rolled oats
- 2 cups cold water
- 1 (14 ounce) can sweetened condensed milk
- 2 tablespoons vanilla extract
- 1 pinch ground cinnamon, or to taste
- Pour water into a tall pot; bring to a boil. Add oats; cook, stirring occasionally, in boiling water until a thin oatmeal forms, about 5 minutes. Remove pot from heat.
- Stir cold water, condensed milk, and vanilla extract into oat mixture; transfer to a pitcher and chill in the refrigerator until cold, at least 1 hour. Pour drink into glasses and sprinkle cinnamon over the top.