Peppermint Mud Pie

14 oz pkg chocolate sandwich cookies, crushed and divided
6 T butter, melted
1/2 gallon peppermint ice cream
16 oz jar hot fudge ice cream topping
8 oz container frozen whipped topping- thawed

Set aside 1/4 cup cookie crumbs. Combine remaining cookie crumbs and melted butter in a large bowl. Toss to coat. Transfer to a greased 9x13 baking pan; press firmly to cover bottom of pan.
Spread ice cream over crumb crust. Top with fudge topping. Freeze until solid. At serving time, spread whipped topping to edges, garnish with reserved cookie crumbs.