Stir together the pumpkin pie spice and granulated sugar. Set aside.
In the bottom of a glass 16 ounce cup, add in the vanilla syrup and cold brew coffee. Fill with ice until it is ⅔ full and stir with a spoon.
In a blender combine the pumpkin pie sauce with the milk, heavy cream, and pumpkin puree. Whip until frothy. Scrape the cold foam onto the top of the iced coffee. Sprinkle pumpkin pie spice mixture on top of cold foam and serve.
Notes
If you want the vanilla flavor in the coffee but not the sugar, add in one half of a vanilla bean when making the cold brew. Make sure to cut it down the middle and scrape the vanilla into the jar as well.