Beat together the cream cheese until creamy and smooth using a handheld mixer in a medium mixing bowl. Slowly mix in the cocoa powder. Beat in the avocado and mix until creamy smooth, approximately 5 minutes.
Add the vanilla extract and sweetener and beat again until smooth, approximately 1-2 minutes.
In a separate mixing bowl, whip the heavy cream until stiff peaks form.
Place the whipped cream in the chocolate mixture and gently fold until it's incorporated.
Place the chocolate mousse in a piping bag and pipe into desired containers. Garnish with dark chocolate shavings.
*Please calculate your OWN nutrition information in a database using the brand names. I recommend My Fitness Pal. Each brand will be different and nutrition information can vary.