In medium microwavable bowl, mix chicken and Greek seasoning. Microwave uncovered on High 1 to 2 minutes, stirring once or twice, until hot. Cover to keep warm.
Heat pita folds as directed on package. Spread each pita fold with about 1 tablespoon hummus. Top with 1/2 cup warm chicken, the cucumber, tomatoes and cheese. Serve topped with yogurt and onion.