Cut the tops off each bell pepper and remove the seeds and membranes. Drizzle the insides with 1 tablespoon of olive oil and sprinkle with salt. Place them upright in a baking dish.
In a medium saucepan, combine the rinsed quinoa and vegetable broth. Bring to a boil, then reduce heat to low, cover, and simmer for about 15 minutes until fluffy.
In a large mixing bowl, combine the cooked quinoa, chickpeas, halved cherry tomatoes, chopped olives, diced red onion, feta cheese (if using), remaining olive oil, oregano, garlic powder, and season with salt and pepper. Mix well.
Spoon the quinoa mixture into each prepared bell pepper, packing it down gently.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and continue baking for an additional 10-15 minutes until the peppers are tender.
Allow to cool for a few minutes, then garnish with freshly chopped parsley before serving.
Notes
For an elegant presentation, serve on a large flat platter with a drizzle of olive oil and a slice of lemon.