First, add the chocolate syrup to your mug. I like to add most to the bottom, as it will mix with the hot espresso. But I will also drizzle some up the sides of the mug as well.
Next, make your espresso. Then pour the espresso shot into the prepared mug.
Next, steam the milk. You want the milk hot and to create some foam on top.
Pour the hot milk into the espresso; the foam will naturally settle on top.
Notes
You can use a milk alternative such as soy or oat milk if you prefer. Additional toppings like whipped cream or marshmallows make a mocha an even more decadent treat!