Heat oven to 350°F. Grease 9-inch square pan. In large bowl, combine all base ingredients; mix well with pastry blender or fork until crumbly. Reserve 1 cup mixture for topping. Press remaining mixture evenly in bottom of greased pan.
In medium bowl, combine all filling ingredients; blend well. Spread filling evenly over base. Sprinkle evenly with reserved crumb mixture; press lightly.
Bake at 350°F. for 30 to 35 minutes or until top is golden brown. Cool 1 hour or until completely cooled. Cut into bars.