Preheat the oven to 200 degrees Celsius.
Remove the chicken from the refrigerator and allow it to come to room temperature before stuffing.
Soak the oats in boiling water for about 30 minutes. Drain off the hot water and rinse thoroughly.
Combine the oats with the other ingredients.
Stuff the chicken with the oat mixture and secure with tooth picks
Brush with olive oil, and place in the oven to cook at 200C for 20 minutes.
Reduce the heat to 180C and cook for a further 40 minutes. Remove from the oven and leave to rest for 10 minutes before carving.