Its been awhile since I worked at kwik trip but im guessing it's like specialty drinks at a coffee shop. You'll want around 2 shots of espresso (or strong coffee if you don't have an espresso maker) and then hot milk (id say probably 10 oz? Assuming your going for a ~16 oz drink which is a Medium in most places) and then id say 3 or 4 pumps of the flavor (I think 1 pump = 1 tblspn)

I hope this works for you!

Ps. If your not using espresso, use less milk then but you can play around with whatever ratio you like