You can add foam milk on the top.With microwave oven:I usually use 2% milk, but cream and half&half make even better foam.Use a a jar with a lid. Fill it with no more than half way to allow room for the foam.Put the lid on and shake the jar as hard as you can, until the milk has become frothy and doubled in size.About 30-40 seconds.Take the lid off and microwave for 30-40 seconds. The foam will rise to the top and voala you can scoop the foam on top.With stove :Fill a medium-sized pan with cold milk, halfway full ( leave room for the foam).Put on low heat. If its electric stove, pre heat the burner before putting the pot on.Start whisking the milk and whisk faster as the milk heats up, but don't let it boil. Once you have enough foam, remove from heat . I like whole milk but low fat or skim milk will foam also.You will need 10-20min.
Making a frothy batch of milk in the microwave is only a 2-step
process. All that is needed is some 2% or nonfat milk poured into your
jar, you then simply shake your sealed jar with the milk inside so that
it starts to bubble and foam-up.
Once you have given it a good shake place the jar directly into the microwave and blast away for a few seconds. By using the microwave you’re helping to stabilize the foam (if you didn’t use a microwave the foam would simply disperse and collapse)
source: here