Heat pan on medium with olive oil. Saute onions until soft and just starting to get golden. Remove onions from the pan and set aside.
Add beef to the pan and stir to separate the slices to ensure they cook quickly and evenly. Add Worchestershire, salt, and pepper. Beef is ready when there are no more pink pieces. (about 3 minutes) Reduce heat to low to keep it warm.
Meanwhile, put the broiler on low.
Arrange 4 hoagie rolls opened up on a baking sheet. Top each roll with 1 & ½ slices of provolone along the roll to cover most of it. Melt cheese on the rolls under the broiler.
Once rolls are ready, add onions and Cheez Whiz to the beef. Stir to melt and combine evenly.
Top each prepared roll with ¼ of the cheesesteak mixture.