Prepare aquafaba (unless you already have some sitting around) by slightly opening a can of garbanzo beans and pouring the liquid into some other container, preferably through a strainer.(You can save the beans in a zipper bag in the fridge for some other use. Hummus, salad, chili…) Add non-dairy milk (2 cups), plant cream (1 cup), and a pinch of salt to a saucepan (at least 1.5 Qt). Also add the nutmeg (½ tsp) either here or in the “egg” bowl (see next step), as long as it goes somewhere.
Add sugar (150g) and corn starch (1 Tbsp) to a mixing bowl, or the bowl of a stand mixer (at least 1.5 Qt). Whisk briefly to combine, just to keep the corn starch from clumping when the liquid gets added later.
Begin heating the “milk” mixture in the saucepan on medium-high. (On my stove, it’s a 7 on a scale of 1-9 plus “LO” & “HI”.) Stir frequently to make sure it does not overcook and start sticking to the bottom of the pan. DO NOT BOIL!
While the “milk” mixture is cooking, add aquafaba (150ml) and JUST Egg (¼ cup) to the mixing bowl. Whisk vigorously to combine and get rid of any clumps.(Don’t forget to keep an eye on the “milk” mixture, which should still be heating and being stirred occasionally.) Here’s the tricky part. Once the “milk” mixture is generating a decent amount of steam, remove from heat. Gradually pour or ladle it into the mixing bowl where the “egg” mixture is, while whisking the contents of the bowl vigorously. The objective is to gradually introduce the warm milk to the “egg” mixture without accidentally “cooking” it, which would result in a curdled, lumpy texture. (Remember, JUST Egg behaves almost identically to scrambled eggs, by design.) By introducing the hot milk gradually and keeping everything moving so no part of it gets hit with all the heat at once, you prevent that from happening. (You may also occasionally need to stir the “milk” mixture again to make sure that doesn’t overcook either, since the saucepan will still be hot.)
Once all that’s done, put the saucepan back on the heat (same heat level as before) and pour the whole tempered mixture from the mixing bowl into the saucepan.
Whisk and/or stir as continuously as you can until the mixture reaches a heat of roughly 160° F, or until it is steaming and/or foaming significantly. (If you choose to whisk it, that alone will probably generate plenty of foam, so a thermometer is the best way to be sure.) I recommend a combination of whisking and using a spoon or spatula to dig down and scrape the “corners” of the saucepan to make sure no mixture is sitting down there, overcooking.
Remove from heat. Add vanilla extract and stir to combine.
Taste a small spoonful of the mixture. It should taste pretty good right away, although the texture and flavors will fully develop after chilling. If it seems under-flavored, add another pinch of salt. (Sometimes I find that it doesn’t taste sweet enough at first, but adding salt actually enhances the sweetness. And the vanilla obviously does as well.)
Allow the mixture to cool, either in the pan or in another container that you know is able to withstand the heat. You will still want to stir it occasionally to make absolutely sure it doesn’t start “cooking” itself again.
Once the mixture is sufficiently cool to the point that you know you won’t have to stir it anymore, pour it into a bottle.
Refrigerate and enjoy!