Turn the Instant Pot on saute mode and add butter, onion and garlic to the inner pot, stirring while cooking for 2-3 minutes until slightly tender. Add in rice, chicken broth, and ½ teaspoon salt.
Close the instant pot lid and turn pressure valve to seal. Cook on manual high pressure for 10 minutes. Allow for a quick pressure release.
Stir, and add in broccoli florets. Close the lid and let sit for an additional 20 minutes to steam the broccoli.