Butterfinger Buster Bar Dessert

1 (18 oz) package Oreo cookies, crushed, divided
4 tbsp margarine, melted
1 (12 oz) jar hot fudge sauce, divided
Half gallon vanilla ice cream, softened
2 Butterfinger bars, crushed

Mix crushed Oreo cookies with melted margarine. Reserve 1 cup for topping. Press remaining cookie mixture in 9-by-13 inch pan. Drizzle half of hot fudge sauce over cookie mixture.

Mix softened ice cream with crushed Butterfinger bars. Spread ice cream mixture over cookie crust. Drizzle with remaining hot fudge sauce and top with reserved Oreo cookies. Freeze until firm.