In a gallon sized-zipper bag, add all ingredients EXCEPT chicken. Mix around until fully incorporated then add Chicken and seal bag. Place in refrigerator to marinade for at least 30 minutes (up to 24 hours).
If making salsa (from recipe below), put it together at least 30 minutes before planning to serve.
Preheat grill or grill pan to medium-high. Once hot, place chicken breasts on grill, reserve marinade. Brush each piece with marinade and cook for 10 minutes. Flip each piece and brush with marinade again. Cook another 10 minutes. Discard remaining marinade.
Remove chicken from grill to a cutting board. Let rest for 5 minutes before chopping.
In a frying pan or grill pan over medium-high heat, cook each tortilla for 20-30 seconds on each side. (Use oil spray, if desired).
To build a taco, smear the cooked tortilla with sour cream and then sprinkle with cheese. Add a portion of chopped chicken. Then top with a hefty scoop of salsa.