Prepare Recipe #492963 set aside. In a medium bowl, combine ground beef, cheese, parsley, garlic, and pepper. Shape mixture into two 1/2-inch-thick patties.
In a large nonstick skillet, cook patties over medium-high heat for 4 minutes per side or until desired doneness. I like mine medium to medium rare. Your choice, of course. Line cut sides of bun halves with spinach. Top with burgers, tomato slices, and sauce. If desired, garnish with red onion.