Start by rinsing the quinoa thoroughly under cold water to remove any bitterness. In a saucepan, combine quinoa and water or broth, then bring it to a boil. Reduce heat, cover, and let it simmer until fluffy and fully cooked.
Preheat your oven to 400°F (200°C) while you prepare the vegetables. Spread chopped zucchini, peppers, onion, and tomatoes on a baking sheet. Drizzle with olive oil, sprinkle seasoning, and roast until tender and slightly caramelized.
Once the quinoa and vegetables are ready, transfer them into a large mixing bowl. Gently toss everything together so the flavors blend evenly. Make sure the vegetables are slightly cooled before mixing.
Stir in fresh parsley, lemon juice, and feta cheese if using. These ingredients bring brightness and a refreshing contrast to the roasted flavors. Mix lightly to keep the texture intact.
You can serve the salad warm right away or let it chill in the fridge for a more refreshing taste. Letting it sit for a bit also helps the flavors deepen and meld beautifully.