Barefoot Contessa (en-US)

¾ cup espresso or strong coffee (regular or decaf) (see note)
2 tablespoons sweetened condensed milk
1 tablespoon simple syrup (see note, page 25)
½ teaspoon pure vanilla extract
1½ cups ice cubes

In a large cocktail shaker, stir together the espresso, condensed milk, simple syrup, and vanilla. Add the ice and shake for a full 30 seconds, until frothy and very cold. Pour the drink and the ice into two 8-ounce glasses and serve ice cold.

I use the “long” rather than “short” setting on my espresso machine. You can certainly make this with strong coffee as well.

Vanilla Coffee Shakerato