Mix gingersnap crumbs, oats, nuts and butter until blended; sprinkle over apple mixture. Cover with lid. Cook on LOW 3 to 5 hours (or on HIGH 2 to 2-1/2 hours).
Beat pudding mix, nutmeg and milk in microwaveable bowl with whisk 2 min. Microwave on HIGH 2 min., stirring after each minute. Spoon over individual servings of dessert.