Add orzo and water (or broth) to the Instant Pot. Lock the lid and set to cook for 2 minutes on high pressure.
Once it's done cooking, quick release the Instant pot.
Stir the orzo to loosen any pieces stuck to the bottom. The orzo will be just a little watery and have a soft but slightly firm texture.
If the orzo is too firm, turn off the Instant pot and let it sit for another 3 to 5 minutes with the lid set back on until the pasta has fully absorbed the water and has the texture you want.
Drain the pasta if water is still in the pot. Stir in some parmesan and serve on its own or use it for one of the easy weeknight meals from the blog!