Heat Oil In Large Skillet Over Medium-High Heat. Add Chicken, Bell Peppers, Onion And Garlic. Cook And Stir 2 Minutes. Reduce Heat To Low. Add Lime Juice, Cumin, Oregano And Black Pepper. Simmer 7 Minutes Or Until Chicken Is No Longer Pink In Center. Season With Salt And Pepper. Serve With Warm Tortillas, Salsa And Sour Cream.