Preheat oven to 350 degrees. Grease and line two 8-inch round cake pans with parchment paper.
Make Funfetti cake as directed on the box. Allow cake to completely cool before assembling the ice cream cake.
In a stainless-steel bowl, whip together, heavy whipping cream, granulated sugar, and vanilla extract until stiff peaks have formed.
Place parchment paper at the bottom of the cheesecake pan. Spread a thin layer of whipped cream.
Place one 8” round Funfetti cake into the cheesecake pan.
Spread softened vanilla ice cream evenly over the cake into the pan and smooth the top.
Place remaining cake on top of ice cream layer.
Spread remaining whipping cream over top of cake.
Place cheesecake pan in the freezer for at least 6 hours to overnight for best results.
Remove cheesecake pan from the freezer. Place cheesecake pan upside down on a cake stand. Unsnap the lock and slide pan off. Remove parchment paper from the top of the cake.
Decorate however you desire. Place cake back into the freezer until you are ready to serve.
Serve and enjoy.