First, turn on your Instant pot to the Saute mode. After it gets heated add butter, chicken, and garlic.
Cook the ingredients until the onion turns transparent. Next add rice, broth, and the seasonings and cook for 5 minutes on manual high pressure and quick release once the timer is up.
Once cooked quickly add the flour and milk mixture and mix well until combined with the mixture.
Finally, add cheese and broccoli and stir in until mixed well. Serve hot.