Brew espresso using your preferred espresso making method. See my 5 Ways To Make Espresso At Home blog post for step by step instructions of the various espresso making method! To a shaker cup or mason jar, add hazelnut syrup, blonde espresso, and ice.
Add the lid and shake vigorously until the entire cup is cold to the touch.
Pour the mixture into a separate glass.
Add oat milk over the top, and enjoy.