Combine rice, water, bouillon powder or paste, garlic powder, chicken breaasts, and broccoli in Instant Pot (in that order).
Add the cream of chicken soup over the top (don't mix it in... it'll scorch on the bottom of the IP if you do).
Seal IP and set on Manual - HIGH and cook for 15 minutes. Let pressure release for 10 minutes, then you can quick release the rest (or just let it go on its own, either way).
Sitr in the cheese.
If the mixture is too runny for your taste, you can set the IP on "SAUTE" and let it simmer, uncovered, for a few minutes until it reduces. But be careful because it CAN easily scorch. Stir stir stir!