Select the SAUTE mode and heat the instant pot, till it says "HOT"
Add Olive oil and butter.To this add onions and saute till translucent.
Add the Garlic,Italian Seasoning and Saute.
To this, add the rice and give it a mix, so the rice is covered with butter and oil.
Add the mushroom, salt and stock.Cancel SAUTE
Close the instant pot lid, select PRESSURE COOK/MANUAL for 6 minutes.
Quick Release after 7 minutes.Open the lid.
Add the cheese and give it a mix.Close the lid again and let the instant pot go into KEEP WARM setting.
Let it sit for 1-3 minutes so that the cheese melts completely.
Video
Notes
Mushrooms*You can add any other kind of vegetables like asparagus, carrots etc too.If using fast cooking vegetables like peas or broccoli, add them along with the cheese.