Add the chicken thighs, then sprinkle all sides evenly with the smoked paprika, garlic powder, and salt. Pour over ⅓ cup BBQ sauce, spreading to evenly coat the chicken.
Cover and cook on high for 2-3 hours, or low for 4-5, or until the chicken is very tender.
Preheat the broiler to high. Carefully remove the cooked chicken thighs to a foil lined broiler safe pan. Thinly brush each thigh with an additional ⅓ cup BBQ sauce. Broil 3-4 minutes, until just browned, keeping a close eye to avoid burning.
Notes
For shredded BBQ chicken thighs: skip step 4 and instead remove the thighs from the slow cooker, shred with two forks, then add back to the slow cooker with the juices and ⅓ cup BBQ sauce.