In a microwave-safe bowl or large plate, add all sliced peppers and onions. Cook for about 5 minutes, until soft.
Cut chicken into strips or chunks and place in bowl. Squeeze lemon juice and toss chicken to coat.
Coat a large nonstick pan with cooking spray. Heat 1 teaspoon olive oil in pan. Add chicken and lemon juice and cook for 3 minutes. Add cooked peppers, onions, seasoning mix, water and mix well. Continue to cook for about 4-5 minutes until chicken is completely cooked. Turn heat down to simmer and continue to cook for about 3-4 minutes until onions are very soft and mixture is very hot.
In the meantime, preheat the oven to 350 degrees. Wrap tortillas in foil and place in oven for about 5-8 minutes or until heated through. Or, wrap tortillas in plastic wrap and heat in microwave for about 25 seconds.
To serve: Spoon ½ cup chicken mixture down the center of each tortilla and let everyone top with their desired toppings. I like to mound mine with lettuce and tomato and eat open-faced with a fork and knife.
This recipe can easily be doubled and tripled. It also freezes great!