In a mixing bowl, whip together heavy cream, cocoa powder, and Torani Sugar Free Chocolate Macadamia Nut Syrup until stiff peaks form. Gently fold in melted chocolate and mix until smooth.
In four glasses, fill with crumbled brownies. Top with mousse and transfer to the fridge to set for at least 2 hours.
When ready to serve, top with a dollop of whipped cream and garnish with chocolate shavings and chopped macadamia nuts.