Crush 9 of the cookies to fine crumbs in food processor; reserve for later use. (Cookies can also be finely crushed in a resealable plastic bag using a rolling pin.)
Crush remaining 36 cookies to fine crumbs; place in medium bowl.
Add cream cheese; mix until well blended.
Roll cookie mixture into 42 balls, about 1-inch in diameter.
Dip balls in chocolate; place on wax paper-covered baking sheet.
Any leftover chocolate can be stored at room temperature for another use.
Sprinkle with reserved cookie crumbs or other toppings.
Refrigerate until firm, about 1 hour.
Store leftover truffles, covered, in refrigerator.
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