Microwave cream cheese spread in medium microwaveable bowl on HIGH 10 sec. Add 5 eggs; whisk until blended.
Heat oil in large ovenproof skillet on medium heat. Add vegetables; cook and stir 3 min. or until crisp-tender. Stir in cream cheese mixture; top with 1/4 cup feta. Cook 5 min. or until center of frittata is almost set. Slip remaining egg onto top of frittata; sprinkle with remaining feta, then thyme.
Broil, 4 inches from heat, 4 to 5 min. or until egg white is set and yolk is cooked to desired doneness.