Add the rice, water, and cinnamon sticks to a high-powered blender. Blend for about 40 to 60 seconds, until the rice and cinnamon sticks are grounded.
Pour the mixture into a large container. Then cover and let it chill in the fridge for 8 to 12 hours, or preferably overnight.
Strain the mixture through a nut-milk bag into a pitcher.
Stir in the milk, vanilla, and maple syrup. Taste test and add more sweetener if needed.
Serve over ice and and garnish with freshly ground cinnamon or cinnamon sticks.
