Combine and stir rice and milk in the rice cooker bowl.
Close the cooker lid and set for the Porridge cycle.
When the rice cooker switches to the "Keep Warm" cycle, open the rice cooker, and add the sugar and vanilla, and stir until combined.
Close the cover and reset for a second Porridge cycle. Stir every 15-20 minutes until the desired consistency is reached. Rice mixture will thicken as it cools. If is comes out too thick, just add more milk.
Serve warm or cool, refrigerate for 1 hour.
When cold, cover with plastic wrap and store for up to 4 days.
You can top with cinnamon and or fruit if desired.