INGREDIENTS
1 lb
Ground beef, lean
8 oz
Brown mushrooms
1
Green bell pepper, small
1
Yellow onion, small
1 cup
Beef broth
2 tbsp
Ketchup
1 tbsp
Worcestershire sauce
1/2 tsp
Black pepper, fresh ground
1 tbsp
Cornstarch
1/2 tsp
Kosher salt
6
Brioche hamburger buns
2 tbsp
Butter
8 oz
Provolone cheese, Slices