If bone-in skinless chicken thighs are not available, just use regular bone-in chicken thighs and remove the skin yourself. The skin removes easily when pulled using a paper towel for grip.
How to Check Meat and Poultry Doneness
The easiest way to ensure that cooked meat or poultry is done is to check the internal temperature. Using an accurate food thermometer will take away the guesswork. Simply insert the thermometer into the thickest part of the meat or poultry, avoiding any bones if present. For whole poultry, insert the thermometer into the thickest part of one of the thighs, again taking care to avoid any bones.