In a medium saucepan melt butterscotch chips and butter over low heat.
Stir in cracker crumbs and mix well. Reserve 2/3 cup of mix. Press remainder into a well buttered glass 9 x 13 pan. Preheat oven to 325
In a bowl beat room temp cream cheese until Beat in condensed milk, egg, and vanilla. Fold in nuts. Pour mixture over crust(will be thin). Scatter remainder of crumbs over top. Bake 25-30 minutes or until done. Cool to room temp. Cut into bars and refrigerate