1 (12 oz.) pkg. butterscotch chips
1/2 c. butter
2 c. graham cracker crumbs
1 c. chopped nuts
1 pkg. cream cheese
1 (14 oz.) can sweetened condensed milk
1 tsp. vanilla
1 egg

Melt chips and butter. Add crumbs and nuts. Put 1/2 of this mixture into a 9 x 13 inch greased pan. Mix remaining ingredients. Pour over crust. Top with remaining crumbs. Freeze.