Pour uncooked noodles and 3 cups water into instant pot. Add onion powder, dry mustard, salt & pepper, and butter on top. You don’t even need to stir!
Set timer for 6 minutes on high pressure, make sure valve is up.
Once complete, release pressure. It will smell like cooked noodles. Do not drain any water at bottom of pot if you have some, it’s ok.
Stir in cream cheese until melted.
Slowly add milk and stir.
Add cheddar cheese and parmesan cheese until melted and blended. It should be ooey gooey at this point! If it’s too sticky, add another tablespoon of butter. Keep instant pot on warm if serving for dinner so it doesn’t start drying inside Immediately transfer to serving bowl and clean your instant pot or you will regret it later.
Enjoy!