Ingredients
- 1.5 pounds ground beef
- 1.3333333730698 cups dry bread crumbs
- 1 egg, slightly beaten
- 0.5 onion, finely chopped
- 0.25 cup milk
- 1 tablespoon Worcestershire sauce
- 1 tablespoon chopped fresh garlic
- 1.5 teaspoons Italian seasoning
- 1 teaspoon dry mustard
- 1 teaspoon salt
- 0.5 teaspoon ground black pepper
- 1 tablespoon butter
- 1 yellow onion, chopped
- 1 (6 ounce) package portobello mushroom caps, chopped
- 1 cup shredded Cheddar cheese
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