K.L.
Hi J.,
I used to work at Starbucks. We make our mochas with mocha sauce, espresso, steamed milk and whipped cream. You can buy the mocha powder to make at home at any Starbucks, it comes in a little container and is very easy to prepare. As far as the espresso goes it is hard to duplicate without an espresso machine. I know you can buy inexpensive stove top espresso machines that work great. From there you would just need to add steamed milk and some whipped cream. Let me know if you have any questions!