Preheat the Oven & Prepare Bell Peppers: Preheat your oven to 375°F (190°C). Slice the tops off the bell peppers and remove the seeds and membranes. Arrange the peppers in a baking dish, cut-side up.
Cook Quinoa: In a medium saucepan, bring the vegetable broth to a boil. Add the quinoa, reduce heat to low, cover, and simmer for 15 minutes, or until the liquid is absorbed. Remove from heat and let it sit, covered, for 5 minutes. Fluff with a fork and set aside.
Sauté Vegetables: While the quinoa is cooking, heat olive oil in a large skillet over medium heat. Add onion and garlic, sautéing until soft and translucent, about 3 minutes. Add zucchini and carrot, cooking until they start to soften, about 5 minutes. Stir in the cherry tomatoes and cook for another 2 minutes. Remove from heat.
Combine Ingredients: In a large bowl, combine the cooked quinoa, sautéed vegetables, crumbled feta, chopped olives, parsley, and oregano. Season with salt and pepper to taste. Mix well.
Stuff the Bell Peppers: Fill each bell pepper with the quinoa and vegetable mixture. Drizzle the tops with a little extra virgin olive oil.
Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for about 20-25 minutes, or until the peppers are tender but still hold their shape.
Serve: Serve the stuffed bell peppers warm, with fresh lemon wedges on the side for squeezing over the top.