In a medium saucepan, combine the rinsed quinoa and vegetable broth. Bring to a boil, then reduce heat, cover, and simmer for 15-20 minutes or until the quinoa is cooked and the liquid is absorbed.
Meanwhile, in a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the chopped onion and minced garlic, sautéing until softened and fragrant.
To the skillet, add the diced cherry tomatoes, sliced Kalamata olives, crumbled feta cheese, and fresh parsley. Sprinkle in the dried oregano, and season with salt and pepper to taste. Mix the ingredients well, allowing the flavors to meld.
Once the quinoa is cooked, add it to the skillet with the prepared filling. Stir thoroughly, ensuring an even distribution of ingredients. Let the mixture simmer for an additional 5 minutes to enhance the flavors.
Preheat your oven to 375°F (190°C).
Drizzle the halved bell peppers with 2 tablespoons of olive oil, ensuring they are well-coated. Season with salt and pepper.
Carefully stuff each bell pepper half with the quinoa and vegetable filling, pressing it down gently to ensure a hearty portion in each.
Arrange the stuffed bell peppers in a baking dish. Cover with foil and bake in the preheated oven for 25-30 minutes or until the peppers are tender.
Remove from the oven and uncover. Sprinkle extra feta cheese and fresh parsley on top for a burst of color and flavor. Serve these Mediterranean Stuffed Bell Peppers hot, embracing the essence of Mediterranean cuisine on your plate.