Veggie Fajita Quinoa Casserole

Name: Veggie Fajita Quinoa Casserole
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Ingredients: 1 cup quinoa; 3 tablespoons olive oil; 1/2 teaspoon crushed chipotle chili flakes (add a little more if you like heat); 1 and 1/2 tablespoons chili powder; 1 and 1/2 teaspoons dried oregano; 1 and 1/2 teaspoons cumin; 1 and 1/2 teaspoons garlic powder; 3/4 teaspoon salt; 1/4 teaspoon black pepper; 1 red bell pepper, seeded and thinly sliced; 1 orange bell pepper, seeded and thinly sliced; 1 yellow bell pepper, seeded and thinly sliced; 1 medium red onion, peeled and thinly sliced; (1) 28 ounce can crushed tomatoes; 1 cup canned white beans, drained and rinsed; 1/4 cup fresh cilantro leaves, chopped; 1 and 1/2 cups Colby-Jack cheese, shredded; Diced avocado, tomato, cilantro, and red onion, diced, for garnish (optional)