Crushed cookies are small pieces of cookies that have been broken down into a fine or coarse texture. This can be done using a food processor, rolling pin, or even by hand. Crushed cookies are often used as a topping or crust in various desserts, adding flavor and texture. Common types of cookies used for crushing include chocolate chip cookies, Oreo cookies, and graham crackers. They can be mixed with ingredients like butter or sugar to create crusts for pies and cheesecakes, or sprinkled on ice cream and yogurt for added crunch.