i make cafe mochas every morning, i find the best recipe is 1/3 espresso 2/3 milk, then i uses nesquik powder according to the instructions (its something like 1 tablesppon per cup)

you can alter it depending on how strong you take your coffee, i myself go with 1 cup espresso (four shots) 1 cup milk, 3 tablespoons nesquik powder

let me know how it works out :)