I did not like my adaptation; it was too rich for me, so I will give you my final alteration of the recipe instead of what I actually made.
3/4 cup almond milk
1/2-3/4 cup water, depending on how rich you want it to be
2 Tablespoons unsweetened cocoa powder
1/2 tsp ground nutmeg
2 1/2 Tablespoons erythritol
2-3 drops liquid Stevia
Combine all ingredients in electric blender or food processor (I just used a wire whisk) and blend until well mixed. Transfer mixture to double boiler; heat, stirring occasionally, until mixture is steaming. Do not boil Serve immediately.
I topped it with real cinnamon/vanilla whipped cream.