Creating Teriyaki Chicken and Rice Casserole can be a fun and straightforward process. Just follow these steps:

1. Preheat Your Oven: Preheat your oven to 350°F (175°C).
2. Cook Chicken: In a large skillet, heat olive oil over medium heat. Add the chopped chicken and season with garlic powder, ginger powder, pepper, and salt. Cook until the chicken is no longer pink (about 5-7 minutes).
3. Combine Ingredients: In a large mixing bowl, combine the cooked chicken, cooked rice, frozen mixed vegetables, green onions, teriyaki sauce, and soy sauce. Mix until all ingredients are well combined.
4. Transfer to Baking Dish: Pour the mixture into a greased 9×13 inch baking dish, spreading it evenly.
5. Add Cheese: Sprinkle the shredded cheddar cheese over the top of the casserole.
6. Bake It: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and golden.
7. Cool: Once done, remove from the oven and let it cool for about 5 minutes before serving.
8. Serve: Scoop out portions and enjoy the meal!

Following these easy steps will lead you to a comforting and delightful Teriyaki Chicken and Rice Casserole that everyone will love.