Place a serving glass in the freezer for a few minutes to chill it while you prepare the drink.
Remove the glass and add the salted caramel syrup and the vanilla extract. Swirl the mixture around the bottom of the glass so the syrup coats it evenly.
Prepare one shot of espresso using your Verismo™ machine: lift the handle, insert the pod, and press the espresso button. Brew the espresso directly into the syrup-coated glass so the coffee mixes with the caramel as it pours.
In a cocktail shaker or jar with a tight lid, combine the cold milk and a handful of ice. Cap and shake vigorously for 8–12 seconds to create a slightly frothy texture.
Fill a second glass with fresh ice. Strain the shaken milk over the espresso in the first chilled glass (pour over the ice in the second glass if you prefer a super-cold drink), then gently stir once to combine.
Finish with an optional drizzle of extra salted caramel sauce across the top. If you like, add a very small pinch of flaky sea salt to enhance the salted notes.