Preheat oven to 400°F (200°C).
In a saucepan, combine quinoa and water. Bring to a boil, then reduce heat, cover, and simmer for 15 minutes or until water is absorbed.
While the quinoa cooks, sauté mushrooms, bell pepper, and zucchini in a pan over medium heat until just tender. Season with garlic powder, oregano, salt, and pepper.
Once quinoa is done, fluff with a fork and divide between two oven-safe bowls.
Top each bowl with sautéed vegetables and marinara sauce. Sprinkle with mozzarella and parmesan cheese.
Place bowls on a baking sheet and bake for 10-12 minutes, or until cheese is melted and bubbly.
Garnish with fresh basil or parsley if desired and serve warm.