Preheat oven to 350°. Arrange pie crust on baking sheet. Evenly spread apple pie filling into crust; set aside.
Combine flour with brown sugar in medium bowl. Stir in Hellmann's® or Best Foods® Real Mayonnaise with fork until mixture is of size coarse crumbs. Stir in walnuts; evenly sprinkle over apples. Bake 45 minutes or until golden and bubbling. Cool slightly on wire rack. Serve warm or at room temperature and, if desired, with Breyers® Ice Cream.