Combine the lemon juice, oregano, oil, salt and garlic in a ziplock bag and shake to combine
Add chicken to the bag, seal and marinate in the fridge for 30 minutes
Remove the chicken from the bag, discard the marinade. Thread the chicken and peppers if using onto the skewers
Either grill or use a griddle to cook for 10 minutes turning frequently and ensuring chicken is cooked evenly
Serve with pitta, salad, tzatiki and Greek rice