To prepare the rim of the glass, pour a little of your favorite low carb granular sweetener onto a plate. Wipe a little of the syrup around the rim of the glass with a paper towel, then carefully roll it in the sweetener. Shake off any excess.

In a small cocktail shaker, add the ice, heavy cream, unsweetened almond milk, vodka, simple syrup, and vanilla extract. 

Close the lid and shake well. Add some ice to your prepared glass and strain the cocktail into the glass.