Place pita bread rounds on a baking sheet. Broil about 2 minutes or until toasted.
In a large skillet, cook chicken, mushrooms, peppers, onions and garlic until chicken is brown and vegetables are tender. Stir in pizza sauce and oregano. Cook and stir until bubbly.
Divide chicken mixture among pita rounds. Sprinkle with mozzarella and broil for 1-2 minutes or until cheese is melted.
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