Prepare rice according to package directions. Preheat oven to 350 and spray a 2 quart casserole dish with cooking spray.
Combine rice, 1/2 cup brown sugar, apple pie filling, cinnamon, raisins and walnuts in a bowl. Pour into prepared dish. In same bowl prepare 1/2 cup brown sugar and oats. Blend in butter mixing well until mixture is moist.