Preheat oven to 350F
Pour the broth, italian seasoning mix and garlic cloves into the instant pot and mix it together.
Add the steak, green onions and onioins and stir. Make sure to break up any clumps of steak so that it will cook evenly. Season with salt and pepper, if desired.
Cook on manual 7 minutes.
While the steak mixture is cooking, mix the melted butter, italian seasoning, garlic and onion powder in a small bowl. Slice each roll down the center and slather the seasoned butter on the hoagie rolls.
Toast for about 7 minutes in the oven until the rolls are warmed through and lightly crisp.
After the instant pot beeps, allow the pot to naturally release pressure for 10 minutes. Then, release the pressure and open the lid.
Using a slotted spoon so the juices run off, scoop the cheesesteak mixture onto the rolls.
Top each roll with two half slices of cheese. Put the hoagie rolls on a sheet pan.
Turn the broiler on high and place the hoagie rolls in the oven for 2-3 minutes or until cheese becomes melted and bubbly.