Place the boneless chicken breasts in a shallow glass container, breast side up.
Season with thyme, pepper, garlic, oil, lemon (juice and zest), salt and olive oil.
Distribute the seasoning evenly over the chicken breasts by rubbing well.
Clean the grill with a grill brush.
Once the grill is clean, rub with an oiled paper towel.
Heat the grill on high for 5 minutes.
Place the chicken breasts, skin side down over the hot grill, reduce the heat to medium and grill for 5 minutes.
Turn the chicken over and grill for another 5 minutes.
Reduce the heat to medium low and finish by cooking for another 5 minutes.
Cook the chicken breasts to an internal temperature of 165°C.