This Chips Ahoy Icebox Cake can be made with Chips Ahoy Cinnamon Thins or regular Chips Ahoy. I used the Thins, so if you use thicker cookies you may need fewer.
Whip the cream, gradually adding the sugar and vanilla.
Spread a very thin layer of whipped cream across the bottom of the dish, then line up 9 cookies.
Top with a layer of whipped cream (about a cup -- but this is an estimate) and then keep layering with more cookies and whipped cream to make 5 layers of 9. Spread whipped cream across top.
Cover and chill for 4 to 6 hours. Regular size Chips Ahoy will take 6 hours to soften, but the Thins will probably be soft in 4.
Sprinkle your favorite type of nuts over the top.
Notes
If you want to cut neat squares, line the pan with plastic wrap, leaving a large overhang on each side. Assemble and chill as directed. After the cookies have softened (about 4 hours), bring the plastic wrap up and over the cake and freeze until firm. Lift from pan and cut into squares.