Chill bowl and beaters for at least an hour in the fridge. Line a 9”x6” pan with parchment paper.
Remove bowl and beaters from the fridge and attach beaters to electric mixer. Add cream, powdered sugar, and vanilla to chilled bowl. Beat till soft peaks form.
Spread cream over 2 biscuits on the side not covered by chocolate. Attach the side with cream on one biscuit to the chocolate side of the other biscuit. Place them standing on the lined pan. Continue attaching the remaining biscuits to the two biscuits to form a log about 5 inches in length. Spread the remaining cream over the entire log evenly. Place in the freezer overnight.