Prepare the espresso shot using an espresso machine or a strong brewed coffee if you don't have access to an espresso machine.
Once the espresso is brewed, add the sweetened condensed milk into the cup with the espresso. Stir the two together until dissolved. This will create a white chocolate flavored mixture. Set it aside to cool for a few minutes.
In a tall glass or mason jar, add the ice cubes.
Pour the cooled sweetened espresso shot over the ice.
Then pour the milk into the glass, stirring gently to combine all the ingredients.
If desired, top with whipped cream for added flavor and presentation.
Serve immediately with a straw and enjoy your Starbucks Copycat Iced White Chocolate Mocha!