1 package (1 ounce) freeze-dried strawberries, coarsely crushed [ST: please record volume (before crushing) in your notes. pw]
Fresh strawberries, optional
Line a 9×9-in. baking pan with parchment paper. Preheat oven to 350°. Finely crush 24 cookies. In a small bowl, mix cookie crumbs and butter. Press onto bottom of prepared pan. Bake until firm, 10-15 minutes. Cool on a wire rack.
Spread vanilla ice cream onto crust; freeze, covered, until firm. Spread with strawberry ice cream then whipped topping; freeze, covered, until firm.
Coarsely crush remaining cookies. Combine cookie crumbs and strawberries; sprinkle over whipped topping. Freeze, covered, until firm, about 8 hours or overnight. Remove cake from freezer 10 minutes before serving. If desired, garnish with fresh strawberries.