Cut up your onion into thin strips. Place in a frying or saute pan you've sprayed with non stick spray over medium-low heat and drizzle with olive oil. Let this cook for about 15 to 20 minutes while you cut up and cook the other ingredients. You want them almost caramelized before you add the next ingredient. Stir every few minutes and add extra olive oil if you find it getting too dry or sticking to the pan.
Cut up your chicken into thin strips, place in a separate frying pan or saute pan you've sprayed with non stick spray, and cook over medium heat until almost brown. Stir it often. Mine took about 10 to 12 minutes but I like mine quick crispy so feel free to reduce cook time to 8 to 10 minutes if you like. Once it's almost cooked add the stir fry sauce and stir often. Then you can add the spices to taste.
While the chicken is cooking you can cut up your peppers and set them aside until the onions are almost caramelized. Once those onions are just starting to turn golden toss the peppers into the same pan as the onions. Cook for about 4 to 5 minutes more depending how you like your peppers. I like mine just starting to soften with a touch of crunch right in the middle. It's all about personal preference with cooking. Feel free to sort of ad lib when cooking. There's no right or wrong way.
Once everything is cooked, toss some fajitas into the microwave for a few seconds to soften them up, then pop some chicken and some peppers and onions into them. You can jazz yours up with whatever you like. I kept mine mild.
Serve with a big old "I need to lie down now" smile!
Keep in mind this is a watered down, more Americanized Mexican dish. I was sick when I cooked this up so I kept it simple and low on the spice barometer. Feel free to amp it up any way you like.