Pre-heat oven to 200°C/ 392°F /gas 6. Cut the peppers in half and deseed them. Place them with cut side up and drizzle with olive oil. Place in the oven and bake for 15 minutes.
Whilst the peppers are baking, chop the courgette and red onion finely. Heat a frying pan. Add the olive oil and fry the red onions and courgette until soft.
Combine cooked red onion and courgette with cooked quinoa, feta cheese (reserve about 1/4 of the feta cheese) and herbs. Combine and add salt and pepper to taste.
Stuff the peppers with the quinoa and vegetable mixture. Crumble the reserved feta cheese over the stuffed peppers.
Place the peppers in the oven again for 5-8 min, and then under the grill for a minute or two, or until golden.
Enjoy the stuffed peppers with spinach, rocket or your green salad of choice!