Place the brown rice, lentils, oats and barley in a fine mesh strainer and rinse well with water. Tap the strainer against the sink to remove as much excess water as possible.
Press the saute setting on your Instant Pot and heat up the inner pot for 2 minutes. Transfer the rinsed grain mixture along with the cinnamon stick to the Instant Pot and saute for 2 minutes, stirring frequently.
Turn off the Instant Pot and add the water. Stir, and then lock the lid into place, making sure the nozzle is in the sealing position.
Use the Manual (or Pressure Cooking) mode and set the timer for 12 minutes. Use the natural release method when the timer goes off.
Remove the lid and add the vanilla. Cool to room temperature, then promptly store in your fridge. You can leave the cinnamon stick in for added flavor or take it out before storing.
Once you have your grains made, heat up however much you want in a saucepan with some non-dairy milk. Place in a bowl and top with chopped nuts, fruit, non-dairy milk and a little sweetener of your choice.