In a medium mixing bowl, whisk together the fresh lemon juice, extra-virgin olive oil, lemon zest, minced garlic, dried oregano, fresh thyme leaves, and a pinch of salt and pepper.
Place the chicken breasts into a resealable plastic bag or a shallow dish. Pour the marinade over the chicken, ensuring that each piece is thoroughly coated. Seal the bag tightly or cover the dish with plastic wrap, and refrigerate for a minimum of 1 hour.
Preheat your grill to medium-high heat.
Once marinated, remove the chicken breasts from the marinade, discarding any remaining liquid.
Carefully place the chicken breasts on the hot grill. Grill for approximately 6-7 minutes on one side without moving them, then flip and continue grilling for an additional 6-7 minutes.
Check for doneness by ensuring the internal temperature reaches 165°F (75°C).
After cooking, transfer the chicken from the grill to a cutting board and let it rest for about 5 minutes before slicing.
Garnish the grilled chicken with fresh chopped parsley and lemon slices before serving.