Add the nut milk, heavy cream, cinnamon and nutmeg to a saucepan and simmer for 9 minutes to infuse.
turn off heat & set aside while you prepare the yolks.
Add egg yolks plus sweetener to a bowl
using a whisk, beat them until they are light, fluffy, and most of the sweetener has dissolved
temper the hot mixture (in the first step) into the egg and sugar mixture.
Return everything to the saucepan
cook over medium heat for 9 minutes
Remove from heat & sieve onto a mixing bowl.
Stir in vanilla
Cover and transfer to the refrigerator to chill.