Add the milk to a 2-cup mason jar. Add 1 teaspoon of caramel syrup if using and close the lid tightly. Shake the jar until foamy, about 1 minute. Remove the lid and microwave the foamy milk until hot, about 1 minute.
Pour the hot coffee into an 8-ounce mug. Top the coffee with the hot milk and spoon over some foam. Drizzle with caramel syrup if desired.
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