In a medium bowl, mix together ground turkey, Mrs. Dash® Onion & Herb, egg substitute, and breadcrumbs until thoroughly blended. Form into four burgers. Spray skillet with vegetable oil, cook burgers approximately 7 minutes on each side. Mix ketchup and Mrs. Dash® Lemon Pepper, spread evenly on one side of each bun. Place burger on each bun, top with shredded lettuce.