1. Heat 1 tablespoon of the oil in large skillet on medium-high heat. Add onion and bell pepper; cook and stir until tender. Remove from skillet.
2. Heat remaining 1 tablespoon oil in same skillet. Add chicken; cook and stir until chicken is cooked through.
3. Stir in Chicken Fajitas Spices & Seasonings and water. Bring to boil, stirring occasionally. Reduce heat to low; simmer 3 minutes, stirring occasionally. Return vegetables to skillet. Add tomato; cooked until heated through.
4. Spoon chicken mixture into warm tortillas. Serve with assorted toppings, if desired.
Chicken Fajita Marinade: Mix Chicken Fajitas Spices & Seasonings, 1/3 cup water, 2 tablespoons oil and 2 tablespoons vinegar in medium bowl. Reserve 1/4 cup marinade for brushing. Place 1 1/2 pounds boneless skinless chicken breasts in remaining marinade; turn to coat. Cover. Refrigerate 30 minutes. Remove chicken from marinade. Discard any remaining marinade. Broil or grill over medium-high heat 6 to 8 minutes per side or until chicken is cooked through, turning frequently and brushing with reserved marinade.