In 10-inch nonstick skillet, over medium heat, saute broccoli, chicken, tomato, onion and tarragon in margarine until broccoli is tender-crisp.
Reduce heat to low.
Pour Egg Beaters evenly into skillet over chicken mixture.
Cover; cook for 5 to 7 minutes or until cooked on bottom and almost set on top.
Slide onto serving platter; cut into wedges to serve.