Instructions

Cut onion in half. Finely chop one half and thinly slice the remaining half. Combine 1/2 cup feta, sun-dried tomatoes, chopped onion, salt and pepper in a large bowl. Crumble turkey over mixture and mix well. Shape into six patties.
Grill burgers, covered, over medium heat or broil 4 in. from the heat for 5-7 minutes on each side or until a thermometer reads 165° and juices run clear.
Meanwhile, in a small nonstick skillet coated with cooking spray, saute sliced onion until tender. Serve burgers on buns with onion and remaining feta.