Line a 10x15-inch jellyroll pan with waxed paper. Coat paper with non-stick vegetable spray and set aside.

In a large mixing bowl, break half of the cookies into coarse pieces with fingers or the back of a wooden spoon.

In a microwave-safe glass or ceramic mixing bowl, melt one package of the white chocolate according to package directions. Remove from microwave and quickly fold in broken cookie pieces. Pour mixture into prepared pan and spread to cover half the pan.

Repeat process with remaining chocolate and cookies, spreading mixture into the other half of pan. Refrigerate until solid, about 1 hour.

Remove bark from the pan and carefully peel off waxed paper. Place bark on a large cutting board and cut with a large chef's knife. Store in airtight container.