Combine first 7 ingredients. Divide mixture into 6 equal portions, shaping each into a 1/2-inch-thick patty.
Heat a grill pan coated with cooking spray over medium-high heat. Add patties; cook 6 minutes on each side or until done. Place 1 patty on bottom half of each roll; top each serving with 1 lettuce leaf, 1 tomato slice, and top half of roll.