Add the remaining ingredients into a high-speed blender & blend together until smooth & well combined, about 2 minutes. (If you don't have a blender, you could also add all the ingredients to a jar with a lid and shake them together.)
Fill a serving glass with ice & pour over the prepared espresso/coffee.
Add the pumpkin chai milk mixture & gently stir to combine. Enjoy immediately as is or top with whipped cream or whipped coconut cream.