Add the white rice, green lentils, and quinoa directly into your rice cooker. Rinse first if you prefer, or leave unwashed.
Pour in 2 cups plus 2 tablespoons of water. If you use the finger method, the water should come up to about the first knuckle on your index finger above the grains.
Close the lid and select the white rice setting on your rice cooker.
Let the rice cooker run through the full cycle until cooked.
Fluff the mixture gently with a spoon or rice paddle.
Serve immediately, or allow to cool and store in an airtight container in the fridge for up to 1 week.
To reheat, add about 1 tablespoon of water to your portion before microwaving to help loosen the grains.