Chicken Casserole

You can find a gazillion chicken casserole recipes on the web.  Mine is taken from one of them and tweaked.
2 chicken breasts, cubed
1 small onion, diced
2-4 tablespoons olive oil
garlic powder to taste
black pepper to taste
Heat olive oil over high heat in a large skillet.  Add cubed chicken and onions.  Add seasoning and saute until chicken [...]