Heat oven to 425°. Split each pita bread around edge with knife to make 2 rounds. Place rounds on ungreased cookie sheet. Bake about 5 minutes or just until crisp.
Mix tomatoes, zucchini, onion, olives and basil in medium bowl. Spread spaghetti sauce evenly over pita rounds. Top with vegetable mixture. Sprinkle with cheese.
Bake 5 to 7 minutes or until cheese is melted. Cut into wedges.