Preheat your oven to 350°F and grease a 9x13 baking dish.
In a bowl, combine the brownie mix, egg, melted butter, and milk. Mix well and pour into the prepared baking dish. Bake for 25-28 minutes or until a toothpick inserted comes out clean. Allow to cool completely.
While the brownie is cooling, prepare the silk layer. In a large bowl, beat the cream cheese with vanilla extract until smooth and creamy. Gradually add in the powdered sugar, mixing well.
Melt the dark chocolate and gently mix it into the cream cheese mixture until well combined.
Fold in the whipped topping to the chocolate and cream cheese mixture, creating a light and silky layer.
Once the brownie base is completely cooled, spread the silk mixture evenly over it.
Top the silk layer with additional whipped topping and garnish with chocolate shavings or mini chocolate chips.
Refrigerate the dessert until ready to serve. Enjoy the luxurious layers of fudgy brownie, silky chocolate, and fluffy whipped cream!