how long to cook a chicken in bbq
1 Bake for 20 minutes and brush a layer of BBQ sauce on the chicken. 2  Return to the oven and repeat brushing with BBQ sauce every 5 minutes until the chicken is cooked through, about 15 to 20 minutes longer. Return to the oven and repeat brushing with BBQ sauce every 5 minutes until the chicken is cooked through, about 15 to 20 minutes longer. 2  Chicken is done when it reaches an internal temperature of 165 degrees F when read with a thermometer inserted into the thickest part of the breast.