Combine first 8 ingredients. Divide mixture into 4 equal portions, shaping each into a 1/2-inch-thick patty.
Heat a large nonstick skillet over medium heat. Coat patties with cooking spray. Add patties to pan; cook 3 minutes. Carefully turn patties over; cook 4 minutes or until done.
Top bottom halves of buns with lettuce and tomato slices. Place patties over tomato slices, and top each with salsa and top halves of buns.