Know the Menu
One of the best things about ordering at fast-food places is finding their secret menus. Most fast-food chains have secret items that you’ll only discover through years and years of hard research. Or you can look online and see what employees say about secret menu items.
But in Starbucks, at least according to the OP, there’s no such thing as a secret menu. That’s because they can prepare anything you want at any time, in any ratio of sweetener and milk, at any temperature, any time of the day. As long as you know the ingredients, you can get the strangest drink possible, and nobody will bat an eye.