For the hot version: Steam and froth the half-and-half.
Pour the half-and-half into your mug and add the flavor syrup, stirring thoroughly.
Pull a shot of espresso and add to the flavored milk.
Finish with the topping of your choice and enjoy! For a drink worthy of Instagram, dust with a bit of cocoa powder.
For the iced version: Fill a glass half full with ice. Make ice cubes with coffee instead of water if you don't want your drink to dilute as it melts.
Add the flavor syrup to the half-and-half and froth but don't steam it to give it texture. Once frothed, pour into the glass with ice.
Add a shot of espresso that has been cooled to room temperature or 1/8 to 1/4 cup cold brew coffee, depending upon how strongly you want the coffee flavor to shine through.
Give it a stir and finish with the topping of your choice. Enjoy!
For the blended version: Add espresso, half-and-half, flavor syrup, and ice to a blender. Blend to your desired texture and enjoy!