Freeze cookies.
Line baking sheet with waxed paper. Remove cookies from the freezer.
Remove 1 ice cream cup from the freezer. Using a small spreader knock the round of ice cream out of the portion cup onto the tray. Using a table knife slice the ice cream in half to make two disks. Place each disk on top of a cookie.
Top ice cream with another cookie. Immediately place both ice cream sandwiches in the freezer. Repeat until all 6 sandwiches are made.
The ice cream sandwiches can be individually wrapped in wax paper held together with an elastic band. Alternately store in an airtight container. Freeze for 4 hours or overnight.
Serve straight from the freezer or place in the fridge to soften slightly for 15-30 minutes before serving.
The sides of the ice cream sandwiches can be garnished with sprinkles after assembly or right when served.