Set pot to saute and add butter and onions. Saute until they have softened. Turn pot off now.
Pour in rice, rosemary, salt and broth. Stir together.
Seal lid and close steam valve. Set to pressure cook high pressure for 8 minutes, then allow for a 1 minute natural release. Then release rest of steam.
Remove lid and fluff rice. Sprinkle in parmesan cheese and fluff again incorporating it into the rice. Serve and enjoy.