Place chicken breasts on a cutting board, cover with a piece of plastic wrap and pound slightly with a meat mallet or rolling pin until even thickness.
In a large bowl, add barbecue sauce, oil, garlic powder, smoked paprika, salt, pepper and whisk. Add chicken breasts, stir with tongs to coat and let marinate for 30 minutes to up to 24 hours.
Preheat grill on medium-high (450-500 degrees F) and rub with oiled paper towel. Place chicken on the grill, brush with BBQ sauce, close the lid and grill for 5 minutes.
Open the lid, brush with more BBQ sauce and flip. Brush with BBQ sauce again, close the lid and cook for another 5 minutes or until internal read thermometer inserted in the thickest part of the breast registers 165 F.
Remove chicken from the oven, cover with foil and let rest for 5-10 minutes.
After slice and serve with your favorite more plain side like rice and broccoli or make BBQ chicken salad.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
Freeze: Freeze whole chicken breasts to retain maximum moisture in an airtight container for up to 3 months.