Philly Cheese Steak Sloppy Joes

Recipe Items
ground beef, lean, 1 pound
20 milliliters of butter
Chopped onion, one little yellow one
One sliced little green bell pepper
chopped brown mushrooms, 8 oz.
mustard, 2 tablespoons
Worcestershire sauce, measuring 1 tablespoon
One-half teaspoon of Kosher salt
Freshly ground black pepper, 1/2 teaspoon
A tablespoon of cornstarch-based
One cup of beef broth
0.8 liters Chop some provolone cheese; 6 ounces is enough if you want it mild.