1. Peel and thinly slice the onion. Rinse, seed and thinly slice bell peppers and tomatoes as well.
2. Cut the chicken (or beef) into thin strips about ½ inch thick.
3. Heat oil in a large skillet on MEDIUM heat. Add all ingredients including your spice packet – except tomatoes – and sauté for approximately 4 minutes. Then, add tomatoes and cook for an additional 1 to 2 minutes.
4. Spoon into warm tortillas and serve the extra filling on the side.
*After rinsing the vegetables make sure to dry them thoroughly or this will cause the water on the vegetables to pop in the hot oil.