Add heavy cream and water to a medium saucepan and bring just to a boil, stirring every so often. Remove from heat and allow to cool slightly while you whisk the eggs.
Add egg yolks and sweetener to a large bowl, and using a whisk or an electric mixer (easier), beat them until light and fluffy. Gradually temper the hot 'milk' into the egg and sugar mixture. Tempering means adding the hot milks little by little to your egg mixture, while whisking constantly so your eggs don't curdle.
Return everything to the saucepan, and simmer over low heat for roughly 8-10 minutes, or until your mixture just begins to simmer. Remove from heat and transfer to a medium mixing bowl (or mason jar). Stir in vanilla or extract of choice. Cover and transfer to the refrigerator to chill overnight.
Your bulletproof coffee creamer will continue to thicken while chilling. So give it a good stir right before serving, and if need be add in a touch more water to thin it slightly.
Keep in the fridge for 5 days, or freeze in an ice cube tray for about a month.
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Notes
*For the coconut version, use 1 1/3 cup of full-fat coconut milk. With roughly an even ratio of the solids and liquids from the can. Just keep in mind that this version is slightly more prone to scrambling, so you’ll want to add in the warm coconut milk veeeery slowly as to not scramble the eggs! Note number two, you'll want to pour the creamer first with the coconut version. Followed by the coffee (slowly!!), so it doesn't split.**Sweet buds vary vastly while on keto and low carb diets. We find that using 4 TBS of sweetener (and a few drops of SweetLeaf’s stevia vanilla drops at the end is more than enough to yield a nice and sweet keto creamer. But if you've got a raging sweet tooth, simply add more to taste! And if using xylitol, make sure to be careful if you have a pup around the house, as it’s highly toxic to the little guys! 🐕Please note that we found a batch to yield about 1 2/3 cup, and nutrition facts were estimated per 1/4 cup serving.