Once your cake has cooled, use a knife to cut out 6 disks of cake that are the same circumference as the pint containers. I just put my pint container on top of the cake and used the knife to cut around it.
Then, use a serrated knife to cut full pint of ice cream into 6 disks. The best way to do this is to cut straight into the pint of ice cream, container and all, then to peel away the container.
Now it’s time to stack! Alternate making layers of cake and ice cream in each of your pints. Cover with seran wrap and freeze for at least 1 hour before serving!