In a mixing bowl, whisk together olive oil, lemon juice, garlic powder, black pepper, and salt.
Place the chicken breasts in the mixing bowl and marinate them in the mixture for at least 30 minutes.
Preheat your grill to medium heat.
Remove the chicken breasts from the marinade and place them on the cedar plank.
Place the cedar plank on the grill and close the lid.
Grill the chicken for about 6-7 minutes per side or until it reaches an internal temperature of 165°F.
Remove the cedar plank from the grill and let the chicken rest for 5 minutes.
Slice the chicken and serve it with your favorite side dishes.