Spray chicken thighs with olive oil spray {I use a Misto} and season both sides with Southwest Seasoning.
Spray the grates on the grill, or rub them down with an oil soaked towel.
Place the chicken thighs skin side down on the grill. Cook for 5 minutes, then flip to the other side and cook for an additional 5 minutes. Continue to flip every 4 minutes until a meat thermometer reaches 165 degrees. {about 30 minutes}
Baste the chicken thighs during the last 8 minutes or so each time you flip them over.
Remove from grill once fully cooked and allow to rest for ten minutes before serving.
Serve with your favorite side dishes, such as Hawaiian Potato Salad, or Bacon Potato Salad, a side salad, and additional barbecue sauce...and lots of napkins!
Notes
The size of the chicken thighs will effect how long they take to cook, but somewhere between 25 and 30 minutes usually does it.
I have a 3 burner gas grill, I do not know how to cook with charcoal but I know it can be done and takes about the same amount of time according to my son, lol