healthy casserole recipe

1 cup quinoa, rinsed - 2 cups vegetable broth - 1 tablespoon olive oil - 1 medium onion, chopped - 2 cloves garlic, minced - 1 red bell pepper, chopped - 1 zucchini, diced - 1 cup cherry tomatoes, halved - 1 cup baby spinach - 1/2 cup frozen peas - 1 teaspoon dried oregano - 1 teaspoon dried basil - Salt and pepper to taste - 1 cup shredded mozzarella cheese (or a dairy-free alternative) - 1/4 cup grated Parmesan cheese (or a dairy-free alternative) - Fresh parsley, chopped (for garnish)