Heat a gas or charcoal grill over medium-high heat until it reaches at least 400 degrees. Let the grill preheat for 5-10 minutes at this temperature to ensure the grates are very hot.
While the grill is preheating, trim the chicken thighs of excess skin and fat then place them onto a platter or large plate. Brush the tops with oil, or spray with nonstick spray, then season with garlic salt, pepper, and a small amount of paprika if desired for color. Flip the chicken thighs over then brush with oil and season the second side with garlic salt and pepper.
Place the chicken thighs smooth-side-down on the grates then close the lid and grill for 3-5 minutes or until the chicken is opaque up and around the sides, grill marks appear on the bottoms, and the chicken does not stick to the grates when you attempt to flip it over.
Close the lid then grill on the second side for another 3-5 minutes or until a meat thermometer inserted into the thickest part of the thigh reads 165 degrees - I like them more around 175 degrees. Note: boneless skinlesschicken thighs can be cooked up to 180-185 degrees and still remain tender, so there’s some wiggle room here. Remove the chicken to a platter then cover with foil and let rest for at least 5 minutes before serving.
Notes
Feel free to use your favorite grilling seasoning blend instead of simply garlic salt and pepper. Meat Church Blanco Seasoning, plus a drizzle of fresh lemon juice, is delicious!
You can use a grill pan over high heat to grill the chicken thighs instead of a gas or charcoal grill.
Be sure your grates are clean before grilling to avoid sticking and burning. I like to use a piece of balled up foil to rub the grates until they’re clean (grill brushes can be hard to clean and leave behind bristles).
Boneless skinless chicken thighs can come in different sizes. If your thighs are smaller or larger than 4-5 per pound, adjust the grilling time accordingly.