Preheat oven to 350F
Pour the broth, italian seasoning mix and garlic cloves into the instant pot and mix it together.
Slice the green peppers and onions.
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 5 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 them for about 10 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 Philly cheesesteaks on a sheet pan.
Turn the broiler on high and place the Philly cheesesteaks in the oven for about 2 minutes or until cheese becomes melted and bubbly.