Using a hand mixer cream together cream cheese, sour cream, heavy whipping cream and erythritol.
Dollop filling into cupcake molds/tin and place in the fridge for 2-3 hours or freezer for 1-2 hours.
Ganache
Add heavy cream to bakers chocolate and melt together in the microwave. Gently mix until the chocolate is completely melted (this may take 1-2 minutes)
Add splash of water and mix until you get a thick liquid consistency.