Brew espresso or strong coffee as desired, and pour it into a mug.

Pour milk and caramel syrup into a 12-ounce or larger mason jar. Microwave for 1 ½ minutes, heating in 30-second increments if needed until hot but not boiling.

Carefully remove the jar, use a towel or potholder as it will be hot.

Put the lid on the jar, and shake vigorously for 30 seconds to 1 minute until the milk has doubled in size.

Remove the lid carefully, being aware of any built-up pressure.

Pour the foamed milk into the mug of espresso, and top with any remaining foam in the jar. Serve immediately with whipped cream and additional caramel drizzle, if desired.