INGREDIENTS
2 tbsp
butter
1
small yellow onion (diced)
1
small green bell pepper (diced)
8 oz
brown mushrooms minced
1/2 tsp
Kosher salt
1/2 tsp
fresh ground black pepper
2 lb
lean ground beef (80/20 or 85/15)
2 tbsp
ketchup
2 tbsp
Worcestershire sauce
2
eggs
1 cup
panko breadcrumbs
8 oz
Provolone Cheese Slices