Bake the Brownie Base: Prepare brownie mix as directed and bake in a 9×13 pan. Let it cool completely.
Whip the Chocolate Mousse: Melt chocolate chips and let cool slightly. Whip heavy cream and powdered sugar until soft peaks, then fold in melted chocolate. Spread over brownie layer.
Add the Vanilla Cheesecake Layer: Beat cream cheese, vanilla, and powdered sugar until smooth. Fold in whipped topping and spread gently over mousse.
Make the Strawberry Mousse: Whip cream and powdered sugar to soft peaks, fold in strawberry puree and color if using. Layer on top of the cheesecake.
Top and Decorate: Chill the whole cake for at least 4 hours or overnight. Before serving, top with whipped cream, chocolate curls, or pink buttercream swirls.
Notes
Chill the cake for at least 4 hours or overnight for best results.
Use red food coloring for a brighter strawberry layer if desired.
Decorate with chocolate curls or sprinkles for a festive touch.