1Spray 9-inch square pan with baking spray with flour. In large microwavable bowl, microwave white chips uncovered on High in 30-second increments, stirring after each, until melted and smooth. Stir in frosting and 1 cup of the crushed cookies. Spread in pan.
2Press remaining 1/2 cup crushed cookies in top of fudge. Cover; refrigerate until firm, about 1 hour. Cut into 4 rows by 4 rows.