Preheat oven to 350° F. Microwave morsels and butter in medium, microwave-safe bowl on MEDIUM-HIGH (70%) power for 1 minute; stir. Microwave at additional 10- to 20-second intervals, stirring until smooth. Stir in crumbs and nuts. Reserve 2 cups crumb mixture; press remaining mixture into ungreased 15 x 10-inch jelly-roll pan. Bake for 12 minutes. Beat cream cheese and sugar in large mixer bowl until creamy. Add eggs one at a time, beating well after each addition. Beat in flour and lemon juice. Pour over crust; sprinkle with reserved crumb mixture. Bake for 20 to 25 minutes or until set. Cool in pan on wire rack. Cut into bars or diamonds; refrigerate. | 
