Preheat oven to 350°F. Grease a 9- × 13-inch pan with nonstick cooking spray.
In a medium bowl combine flour and butter using a pastry cutter. Press into bottom of baking pan. Bake 25 minutes or until golden brown. Cool.
In a medium bowl beat cream cheese and sugar until smooth. Juice lemon into mixture; continue mixing until blended.
Pour mixture over cooled crust. Set aside.
In a medium bowl whisk pudding mix and milk until thickened. Spread over cream cheese mixture. Spread whipped topping over pudding layer. Sprinkle with chopped pecans. Makes 18 servings.