Add the heavy cream, liquid Erythritol, pure vanilla extract, pumpkin pie spice, and a pinch of salt in a shaker or mixing glass.
Whisk or shake until it thickens. Using a milk frother gives the frothier result.
Whisk in the pumpkin puree and set aside.
Mix the cold brew with the liquid Erythritol and vanilla.
Pour the cold brew coffee into your serving glasses (optionally over ice), divide the pumpkin cream mixture on top, and garnish with pumpkin spice. Serve cold.