Zesty Chicken Fajitas

1 lb. boneless, skinless chicken breasts, cut into strips
1/2 cup Italian dressing
1 cup picante sauce
2 Tbsp. vegetable oil
1 lg. onion, sliced and separated into rings
2 lg. sweet red peppers
2 lg. sweet green peppers
6 flour tortillas, warmed
salsa and sour cream (optional )
Directions: Place the chicken in a resealable storage bag. Pour in the salad dressing and picante sauce. Seal the bag, and marinate the chicken in the refrigerator for at least 30 min. Heat one tablespoon of oil in a large skillet; then gradually add the onions and peppers. Cook until tender. Place in another dish, and set aside. Heat the other Tbsp. of oil in the skillet, and add the chicken. Cook about five min. or until brown, stirring constantly. When cooked, place the chicken, onions, and peppers on a serving dish. Fill tortillas with the mixture. Garnish with salsa and sour cream, if desired.