Add 1 cup uncooked quinoa to Instant Pot.
Add water, rice milk, apple, raisins, dates, vanilla and cinnamon and close lid.
Be sure the steam release is in the closed position and manually select 12 minutes high-pressure cooking time.
When the timer beeps at the end of the cooking cycle, turn the pot off and allow time for the natural release of pressure (about 15-20 minutes.)
Once pressure is released, carefully open the lid and stir porridge with a long-handled spoon.
Add more plant-milk to individual servings to achieve preferred consistency. Sprinkle with chopped nuts if desired.