Heat the water just until simmering (208°-212°F) and add to the mug. Steep for 5 minutes.
6 ounces water
Remove and discard the teabag.
Steam the milk until it reaches 165°F. If you do not have a wand steamer, you can warm the milk on the stove and use a handheld frother to froth the milk.
4 ounces whole milk
Pour the milk into the mug, holding back the foam with a spoon until almost full and spooning on top.
Notes
I find that 1 tablespoon of vanilla simple syrup is perfect for me, but you can add more or less to taste.
Vanilla extract can be used as an alternative to the simple syrup for those who are watching calories or prefer a less sweet drink.
To make an iced version. Steep the tea then shake with ice in a cocktail shaker. Strain over fresh ice and add the simple syrup and cold milk.