Arrange crackers on bottom of 9x9 baking dish. Cut crackers to fit.
Microwave 15 caramels and 2 tablespoons milk on high 1 minute to 1½ minutes or until caramels are melted and becomes smooth, stirring after 1 minute.
Spread over crackers. Sprinkle with ½ of the walnuts then refrigerate.
Pour 1 cup milk into a large bowl. Add pudding mix. Beat with wire whisk 1 to 2 minutes. Gently add about half of the Whipped Topping. Spread over caramel layer. Refrigerate for 3 hours. Garnish with remaining whipped topping, walnuts, apples and marshmallows. Microwave the remaining caramel with 1 tablespoon milk for 1 minute until melted and smooth; stirring after 30 seconds. Drizzle over the dessert. Serve
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-caramel-apple-with-marshmallows/