The amount of milk used depends on the size of your drink. If you’re making a 12 ounce mocha, you’ll need 7-9 ounces of milk. You’re accounting for the espresso in the drink, the amount of chocolate, and the froth of the milk once you steam it.
The amount of chocolate in the drink is completely up to you. Add as little or as much as you want. Start with 2 tablespoons and add more if you want a stronger chocolate flavor.
Popular add-ons to mochas are whipped cream, powdered cocoa, and marshmallows.