Heat oven to 375°F. Spray 9-inch square pan with cooking spray.
In large bowl, place cookie mix. Cut in butter, using pastry blender or fork, until mixture is crumbly (do not overmix). Reserve 1 cup cookie mixture for topping; set aside. Press remaining mixture in bottom of pan. Bake 15 minutes.
In medium bowl, mix Filling ingredients. Spread mixture on partially baked crust. Sprinkle reserved cookie mixture over filling.
Bake 32 to 36 minutes or until light golden brown and bubbling along edges. Cool 4 hours. Cut into 4 rows by 4 rows. Cover and refrigerate any remaining bars.