Preheat oven to 300 degrees Fahrenheit. Spray 2 muffin tins with an oil of choice. Then in a medium bowl, beat cream cheese, vanilla extract, sweetener, and egg yolks until smooth.

In a separate bowl, whip the egg whites and cream of tartar with an electric mixer until stiff peaks form.

Next, carefully fold the whipped egg whites into the yolk mixture. Be careful to not deflate the whites when doing so.

Scoop about two tablespoons of the mixture into each muffin tin.

Place in preheated oven and bake for 30-35 minutes or until golden brown.

Once done, remove the cake from the muffin tins and place on a cooling rack.

While the cakes are cooling, combine all frosting ingredients together in a medium bowl.

Beat with an electric mixer until smooth.

Transfer frosting to pastry bag with wide tip.

Set aside 3 layers for each cake and then pipe frosting in between each layer of cake.