Preheat the grill to medium-high heat to around 375°F to 450°F.
In a bowl, combine 1 teaspoon of salt, 1 teaspoon of black pepper, 1 teaspoon of garlic powder, and 1 teaspoon of onion powder.
Rub the seasoning mixture all over the chicken breasts, ensuring every inch is coated.
Place the seasoned chicken on the grill and cook for about 6-7 minutes on each side.
In the last few minutes of cooking, brush 1 cup of BBQ sauce over each chicken breast.
Check the internal temperature to ensure each piece reaches 165°F (75°C).
Remove the chicken from the grill and let it rest for about 5 minutes.
Serve sliced or whole with additional BBQ sauce on the side.