Using a food processor or blender, grind Biscoff cookies into a fine powder.
In a bowl add cookie powder and frosting. Mix until well blended.
Form into small 1/2 tablespoon size balls. Place in the freezer to chill while preparing the chocolate.
In a microwave-safe bowl, melt white chocolate and coconut oil (optional). Heat 30 seconds at a time stirring in between until chocolate is smooth (usually only takes 60-90 seconds).
Once the cookie centers have become cold and firm, dip each ball into the melted white chocolate.
Place dipped truffles on a cookie sheet lined with waxed paper or parchment. Add sprinkles or cookie crumbs immediately before white chocolate sets. Place in fridge or freezer for a quick set.