1. Gently combine first 5 ingredients. Shape mixture into 6 (4-inch) patties.
2. Heat a cast-iron grill pan over medium-high heat. Cook patties in pan 6 to 8 minutes on each side or until done. Serve burgers on buns with desired toppings.
Note: We tested with Publix French Hamburger Buns, McCormick California Style Garlic Salt with Parsley, and Lea & Perrins Marinade for Chicken.