Add the heavy cream and almond milk to a saucepan over medium heat. Bring the mixture to a boil, while occasionally whisking. Take it off the heat once it boils, and set it aside for a few minutes.
Step 2
Meanwhile, add the egg yolk and sweetener to a bowl. Whisk for 2 minutes until pale and fluffy. Mix in the vanilla extract.
Step 3
To the whisked yolk, slowly drizzle the heavy cream mixture with one hand while whisking with the other. Return the mixture to the saucepan over medium-low heat. Keep whisking until the mixture starts simmering.
Step 4
Drop the heat to low, and let the creamer simmer for 3 minutes to thicken, occasionally whisking. Take the pan off the heat, and pour the creamer into a glass bottle or jar. Use immediately or store in the fridge for up to 4 days.