Brew a shot of espresso using your espresso machine or coffee maker. If using a French press or Moka pot, follow the respective instructions for making strong coffee.
While the espresso is brewing, pour the milk into a microwave-safe container and heat it for about 1 minute, or until it is warm but not boiling.
Froth the warm milk using your milk frother until it becomes creamy and frothy. If you don't have a milk frother, you can vigorously whisk the milk by hand or use other frothing methods.
Fill a tall glass with ice cubes.
Pour the freshly brewed espresso over the ice cubes, followed by the frothed milk.
Stir gently to combine the espresso and milk together.
Taste the latte and add sugar according to your preference, stirring again to dissolve the sugar.
Enjoy your homemade Dunkin' Donuts Iced Latte immediately!