Fill a 20 oz or larger glass with 1.5 cups of ice cubes.
Pour 16 oz of cold brew coffee or chilled double-strength coffee over the ice.
Add 2 tablespoons (approximately 2-3 pumps) of sugar-free vanilla syrup.
Pour 2 tablespoons of heavy whipping cream into the mixture.
Stir the beverage thoroughly for 20 seconds with a long spoon or straw to ensure the cream is emulsified and the syrup is evenly distributed.