1. Cook quinoa: In a pot, bring water to a boil. Add quinoa, reduce heat, cover, and simmer for 15 minutes or until water is absorbed. Fluff with a fork.
2. Heat olive oil in a wok over medium heat. Add onion and garlic, sauté until fragrant.
3. Add bell pepper, zucchini, and broccoli. Stir-fry for 5-7 minutes until vegetables are tender-crisp.
4. Stir in cooked quinoa, soy sauce, sesame oil, salt, and pepper. Mix well and cook for another 2-3 minutes.