Remove the cream cheese from the fridge, place it in a bowl together with vanilla extract, and allow it to soften before making the low carb chocolate ganache.
In a second bowl, combine cocoa powder with granular sweetener and a pinch of salt.
Gradually mix the dry ingredients into the bowl with cream cheese, while pouring in the milk. Start with 2 tablespoons and add more if necessary. The mixture should be smooth and thick, without any cocoa lump. If it is necessary, adjust with more sweetener to taste.
Once the dessert has cooled, spread low carb chocolate ganache over the chocolate keto cake. If desired, decorate with sugar-free chocolate chips.
Refrigerate the cake to allow the ganache to set. Once ready, serve right away or keep stored in the fridge until eating.