Preheat the oven to 350 degrees. Slice the tops off of the peppers and deseed them.
Place the ground beef and onion in a skillet over medium high heat. Saute until the beef is browned and the onion has softened.
Stir in the chopped mushrooms.
Mix in the beef broth, worcestershire sauce, ketchup and salt and pepper to taste.
Simmer until the liquid is almost all absorbed. Stuff the peppers with the meat mixture.
Sprinkle with the cheese. Tent a piece of tin foil over the baking dish and bake for 45 minutes.
Enjoy!
Tips For Making Philly Cheesesteak Stuffed Peppers:
when picking out peppers, try to find peppers that are even and stand up on an even bottom
if you find that your peppers won’t stand, simply roll up some foil and place it around the bottom of any pepper that might be lopsided or falling over.
you can tell when your peppers are done cooking, by poking with a fork to see if the skin has become soft.