1Split pita bread around edge with knife to make 2 rounds. Spread pizza sauce on bread halves; place on small microwavable plates.
2Place zucchini and onion in 2-cup microwavable casserole. Microwave uncovered on High 2 minutes 30 seconds to 3 minutes or until tender. Stir in tomatoes, olives, salt and basil.
3Spoon vegetables onto bread halves; top with cheese. Microwave uncovered on High 45 to 60 seconds or until hot. Cut into wedges.