Ingredients:
1 tablespoon oil
1 onion, diced
1 green bell pepper, diced
8 ounces mushrooms, diced
2 cloves garlic, chopped
2 pounds of ground beef
1/2 teaspoon salt
1/2 teaspoon pepper
1/2 cup cheese whiz (optional)
1 teaspoon Worcestershire sauce
2 tablespoons ketchup
2 eggs
1 cup panko breadcrumbs (gluten-free for gluten-free)
4 ounces provolone (optional)
8 slices provolone