Heat oven to 350~. Grease 12" pizza pan or 13x9" pan. In large bowl, combine cake mix, 1 cup oats and 6 tablespoons margarine at low speed until crumbly. Reserve 1 cup crumbs for topping. To remaining crumbs blend in egg. Press in prepared pan. Bake at 350~ for 12 minutes. In same large bowl, add remaining 1/4 cup oats, 2 tablespoons margarine, nuts, sugar and cinnamon, to reserve crumbs; mix well. Remove base from oven and spread pie filling evenly over top. Sprinkle with reserved crumb mixture. Return to oven and bake 15-20 minutes or until crumbs are light golden brown. Cool completely. Cut in wedges or squares. Makes 12 servings.