Start by brewing your double shot of espresso using whatever method you have on hand. If you don't own an espresso machine, a strong stovetop moka pot or even concentrated drip coffee will do the job just fine.
While your espresso brews, heat your milk in a saucepan or microwave until it's warm but not boiling. Use a frother or whisk to create a light, airy foam on top for that classic latte texture.
Stir the hazelnut extract and syrup directly into the warm milk before combining it with your coffee. Mixing it in at this stage helps the flavor distribute evenly instead of settling at the bottom of your cup.
Pour your espresso into a mug first, then add the hazelnut milk mixture on top. Taste it and stir in your sweetener of choice, adjusting until it hits the sweetness level you're craving.
For a hot hazelnut latte recipe, simply enjoy it as is while it's warm. If you'd rather have it cold, let everything cool slightly, then pour it over a glass full of ice for a refreshing version