Turn Your instant pot onto saute mode
Fry hamburger and onion until the hamburger is brown, and your onion is translucent
Hit the cancel button on your instant pot.
Add broth, corn, tomatoes, salsa, and seasoning and stir.
Add broth, corn, tomatoes, salsa, and seasoning and stir.Add noodles on top DO NOT STIR. Stirring your noodles causes them to stick to the bottom.
Put your lid on and seal.
Set to pressure cook for 7 minutes.
When done, release the steam and stir.
Stir in cheese.