Dust countertop with flour. Add sheet and dust top with flour. Cut a sheet into three sections (rifrigerate the third one). Work with two at a time, keeping the rest refrigerated.
Roll out each section into about 9"x12" rectangle. Poke top with a fork for even baking.
Bake at 400°F for 6-8 minutes, until golden in color.
Repeat process with the next two sections and finally the last two. Cool sheets completely before assembling.
Prepare cream-
Beat cream cheese and butter until smooth. Add condensed milk, powdered sugar, and marshmallow puff creme; beat until incorporated. Last, add cool whip; beat on low speed.
Assemble cake-
Once layers have cooled, trim edges so they are straight and crush or decor.
Add the first layer onto a cake stand, cover with cream. Repeat with all of the layers. Cover top and sides with remaining cream.
Coat the sides and around the edges on top of the cake with the leftover crumbs or the entire cake can be covered with the crumbs.
Dust with posted sugar. Keep refrigerated at least 2 hours (or overnight).