Cut the tops off the bell peppers and remove the seeds and membranes. Lightly drizzle the outside with olive oil and place them upright in a baking dish.
In a medium saucepan, combine the rinsed quinoa and vegetable broth. Bring to a boil, then reduce the heat to low, cover, and simmer for about 15 minutes, or until the quinoa is fluffy and the liquid is absorbed.
In a large mixing bowl, combine the cooked quinoa, cherry tomatoes, chickpeas, olives, feta cheese, parsley, dried oregano, garlic powder, and red pepper flakes (if using). Mix well, and season with salt and pepper to taste.
Spoon the quinoa mixture into each bell pepper until filled generously.
Drizzle the tops of the stuffed peppers with a little olive oil.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, or until the peppers are tender and the tops are slightly golden.
Allow to cool slightly before serving.
Notes
Serve on a vibrant platter, drizzled with balsamic reduction for an extra touch of flavor.