This one is different. It's one I created and it's actually pretty good. It's easy.
1 - 2 lb. boneless, skinless chicken breast (you can use other cuts, but we prefer chicken breast meat)
Lemon juice
Fajita seasing, I use McCormick's***
Place chicken breast in a ziploc bag or a container with a secure lid. Pour about 2 - 3 tablespoons of lemon juice over the chicken - the amount can vary depending on how much chicken you actually use. This is one of those times I don't measure, so I'm not sure of the exact amount of lemon juice.
Sprinkle fajita seasoning on the chicken, on both sides. The amount is up to you, we prefer it to be fairly spicy so I use a LOT of seasoning.
Let it marinate in the refrigerator for several hours. I also prepare it in ziploc bags and then freeze it for later use, thaw it out in the fridge (generally overnight) and by the time it's thawed it is well marinated. If using a bag, flip the bag over about half way through the marinating process. If you are using a container, you can turn the individual pieces over. Drain off and discard any remaining marinade liquid.
I usually bake the chicken in the microwave, but it can also be cooked in a small amount of olive oil on the stove. You'll want to use a good, non-stick pan if you prefer to use the stove. You can add more fajita seasoning at this point if you think you need it. When the chicken is cooked through, drain it well and cut into bite-size pieces. If using the microwave, the chicken pieces will need to be turned and cooked on both sides. I usually give it about 4 minute per side. Depending on the thickness of the chicken, it might need to be flipped more than once.
This is where it gets different. The amounts on the next ingredients are also not measured but I'm guessing.
Next ingredients:
Yellow squash (1 or 2)
Zuchinni squash (1 or 2) (the squashes need to be sliced or chopped)
Onion, chopped (at least half of one onion but I usually use more)
Bell pepper, chopped (1)
Carrots, peeled and sliced (2 or 3)
Celery, chopped (2 or 3 stalks)
Jalepenos, chopped (optional)
Any other fresh vegetable you like.
Saute the veggies in a small amount of olive oil. It's a good idea to start with the carrots first as they take longer to cook. Then add the rest of the vegetables and stir frequently. When they are warmed and slightly cooked to the crisp-tender stage, add the chopped chicken. There may be a lot of liquid left in the pan, thanks to the squash. Also, you'll want to make sure you have a large pan for this stage. Non-stick works best. You could also use a wok and we have used a griddle for it (such as for pancakes) but it didn't work as well. And then there is always the old standard, cast iron!
Serve on warmed tortillas. Add shredded cheese, sour cream if desired, tomatos, lettuce as desired and top with picante sauce. (True Texans only use Pace brand!)
It also makes a wonderful taco salad. Prepare as directed but then instead of tortillas, place it on a bed of lettuce with the other "normal" taco toppings - cheese, tomatos, etc.
The squash and carrots make it different from standard fajitas but they give it a wonderful flavor. It would probably work as well with beef, but we haven't tried it.
***I have made my own seasoning before, I use an assortment of spices. Finely ground black pepper, garlic powder, a little salt are the base ingredients and then I use whatever I happen to have on hand and feel like at the time.