My friend's mom owns a yakiniku resteraunt but she also cooks various other foods. This is her chahan recipe.
She really uses chashaorou (chaashuu) but I don't know the word in English, but she said Bacon is okay too.
If you like green peas, you can add 2 tbsps. (I don't like green peas, that's why I didn't add them into the ingredients list).
Use how ever much olive oil, salt, and pepper you think you need.