Place the brown rice in a fine sieve and rinse under cold running water to remove any excess starch.
Add the rinsed rice, cold water, salt and olive oil (if using) to the pressure cooker, then stir to combine.
Secure the lid, set the valve to 'Sealing' and select the high-pressure setting. Cook for 22 minutes.
Let the pressure release naturally for 10-15 minutes, then carefully switch the valve to 'Venting' to release any remaining steam.
Remove the lid and fluff the rice gently with a fork. Serve immediately or use as a base for bowls and stir-fries.