Heat oven to 375 degrees. Grease a 13x9-inch pan with shortening or cooking spray. In a large bowl, beat crust ingredients with electric mixer on low speed until mixture looks like coarse crumbs. Press into prepared pan
Bake 15 minutes or until golden brown. Cool about 30 minutes. Reduce oven to 350 degrees.
Spoon pie filling evenly over crust. In a medium bowl mix dry crumble ingredients. Cut in butter with a fork or fingers until crumbly. Sprinkle evenly over filling and press lightly.
Bake 40 minutes or until crumble is a light brown. Cool completely, about two hours, then cut into bars.