In a mixing bowl, whisk together olive oil, soy sauce, brown sugar, garlic, and black pepper.
Place pork chops in a resealable bag or shallow dish and pour the marinade over them. Ensure they are well coated.
Marinate in the refrigerator for at least 1 hour, or overnight for best results.
Preheat grill or skillet to medium-high heat. Cook pork chops for 6-7 minutes on each side, or until they reach an internal temperature of 145°F (63°C).
Let the pork chops rest for a few minutes before serving.