Preheat the grill to medium-high heat
Pound chicken breasts to an even thickness
Pat the chicken breasts dry
Brush both sides with oil
Season with salt, pepper, and any desired spices
Place chicken breasts on the grill
Grill for 5 to 7 minutes per side
Flip only once
Brush with barbecue sauce during the last few minutes if desired
Cook until the internal temperature reaches 165°F
Remove from the grill
Let rest for 5 minutes before serving