
Crush the cookies in any way convenient for you. I have a convenient large combine, it fits a large amount of products at once, I grind in German. Someone prefers a meat grinder, so, by the way, they made cookies in my childhood. Or you can get by with a simple rolling pin. Fold the biscuits into a tight bag and beat them properly with a rolling pin. In this case, the crumb will be large enough, which, however, will not affect the taste of the cakes in any way.