Combine all ingredients for marinade and stir together
Slice chicken into 1/2" thick strips and add to marinade, allow to marinate for at least 1 hour.
Place chicken onto baking sheets (I prefer to foil line the sheets), retaining extra marinade
Add onion, bell peppers and poblano (choose your favorite veggies for roasting) and add these into the remaining marinade and stir to coat.
Set your oven to Broil and allow it to heat up for about 5 - 10 minutes. Start placing baking sheets of chicken one at a time directly under the broiler to cook for approximately 10 minutes or until the edges start to turn golden. Once chicken has completed cooking, remove and place on a plate to rest. Place marinated vegetables onto a sheet pan under the broiler and broil for 10 - 15 minutes, or until a slight char has formed.
While the chicken and vegetables are broiling, heat oil covering the bottom of a small frying pan. Fry the yellow corn tortillas one at a time in the oil, about 10 - 15 seconds per side on medium low heat. The center should start to form small bubbles before flipping, and the edge should have a very slight golden color.
Remove the tortilla and place on a plate with paper towel, folding it into the form of a taco to cool.
Once tortillas, chicken and vegetables are done cooking, you can assemble your fajitas with your desired toppings.