In an electric skillet or stovetop skillet, medium high heat, brown the beef / cook it thorough to almost thorough. Season with Chicago Seasoning while its raw.

While that's cooking, slice the onion and green pepper.

When the beef is done, add the packet of brown gravy and mix. If you have enough grease in the pan, you probably don't need to add water, but if you don't have much grease in the pan, you can add a couple TBSP of water to help the gravy spread to all the meat.

Add onion and green pepper and mushroom. Cover with lid.

Cook about 5 more minutes until the veggies get a little tender. Maybe 10 minutes. Whatever is your preference on veggie tenderness.

Turn off heat. Add the mozzarella cheese and mayonnaise, and mix it into one big pile of sloppy slop.

If you want the carbs, you can serve this in hot dog buns (they are the easiest) or hamburger buns. If you don't want the carbs, this is fine on a plate and eat it with a fork. You can sprinkle a little extra mozzarella on top for aesthetic reasons.