Instructions: Combine first 4 ingredients in a large bowl; shape into 12 patties. Set aside.

Saute onion in a large nonstick skillet coated with cooking spray 10 minutes or until tender.

Top 6 patties with onion, cheese, and relish; cover with remaining 6 patties, pressing edges to seal. Cook patties in batches in nonstick skillet over medium heat 8 minutes on each side or until beef is no longer pink. Serve in buns with desired toppings.

This recipe yields 6 servings.

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