In a mixing bowl or mason jar, stir together heavy cream, sweetened condensed milk, pumpkin puree, vanilla syrup, and pumpkin pie spice until combined.
Cover and refrigerate the mixture until cold (up to 7 days).
When you’re ready for a drink, pour the amount you need into a glass and use a handheld milk frother (hand/electric milk frother or even a french press) to whip into a thick, pumpkin foam.
Pour over cold brew coffee and dust the top of the coffee with a pinch of pumpkin pie spice. Enjoy that first sip!
Notes
Works beautifully over cold brew coffee or hot coffee (foam melts faster in hot).
Store any base mixture in an airtight container in the fridge; give it a quick froth per serving.
Prefer a different sweetness? Use extra maple syrup or brown sugar simple syrup.
The warm mixture of cinnamon and spices gives that classic pumpkin spice flavor without the additives you’ll often see in bottled sauces.