Combine lean ground beef, minced onion, grated Parmesan cheese, minced fresh parsley, beaten egg, dried Italian seasoning, pepper, garlic salt, and fennel seed in a bowl.

Shape the mixture into 4 equal-sized patties.

Preheat grill to medium-high heat.

Place patties on the grill, cover, and cook for 7-8 minutes on each side, or until the beef is no longer pink inside.

Top each patty with a slice of provolone cheese.

Continue grilling for 1 minute more, or until the cheese is melted and bubbly.

While the cheese is melting, place split English muffins on the grill, cut sides down.

Grill the muffins for 1 minute, or until lightly toasted.

Spread 2 tablespoons of pasta sauce on the bottom half of each toasted muffin.

Place a cheese-topped patty on top of the sauce.

Cover with the muffin top and serve immediately.