Creating your Teriyaki Chicken and Rice Casserole can be as easy as following these straightforward steps:

1. Preheat your Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare Chicken: In a large skillet, heat sesame oil over medium heat. Add the diced chicken, season with black pepper and salt, and cook until browned, about 5-7 minutes.
3. Sauté Vegetables: Add minced garlic, ginger, broccoli, bell peppers, and carrots to the skillet. Sauté for another 5 minutes until the vegetables are tender.
4. Combine Sauces: In a small bowl, mix together soy sauce, teriyaki sauce, honey (or brown sugar), and red pepper flakes if using. Pour this sauce over the chicken and vegetables in the skillet. Stir to combine and let simmer for 2-3 minutes.
5. Mix with Rice: In a large bowl, combine the cooked rice with the chicken and vegetable mixture. Stir in the green onions and ensure everything is well mixed.
6. Transfer to Baking Dish: Pour the rice mixture into a greased 9×13-inch baking dish, spreading it out evenly.
7. Bake: Cover the dish with aluminum foil and bake for 30 minutes. Remove the foil and bake for an additional 10-15 minutes, allowing the top to become slightly crispy.
8. Rest: Once baked, take it out of the oven and let the casserole rest for about 10 minutes before serving.
9. Garnish: Before serving, sprinkle sesame seeds over the top for an added crunch and aesthetic appeal.

These steps will help you create a delicious, hearty Teriyaki Chicken and Rice Casserole that your family will love.