Step 1

Prepare the brownie batter according to package directions.

Step 2

Pour the batter into a 9 inch springform pan that has been sprayed with baking spray.

Step 3

Bake according to the boxed instructions for a 9 x 9 pan. Allow to cool completely.

Step 4

Place finely chopped chocolate in a large bowl.

Step 5

Microwave 1 cup of heavy cream for 2 minutes in a microwave safe container.

Step 6

Pour hot cream over chocolate and stir until the chocolate is melted completely. Stir in the vanilla extract and salt. Allow to cool for 10 minutes before adding the whipped cream.

Step 7

In a medium bowl, beat 2 cups of heavy cream and the sugar until soft to medium peaks form.

Step 8

Stir in ½ cup of the whipped cream into the chocolate mixture to lighten it. Then, gently fold the remaining whipped cream into the chocolate until no white streaks remain.

Step 9

Pour the mixture over the top of the brownie crust and smooth the top. Cover and refrigerate for at least 6 hours or overnight.

Step 10

In a medium bowl, whip together cream and sugar until stiff peaks form. Pipe onto the chilled cake or dollop on top of individual slices.