Heat oven to 350 F. Grease 13-by-9-inch baking pan.
Beat dry cake mix and 1/2 cup softened butter until crumbly. Spoon 1 cup into medium bowl & set aside.
Add 3/4 cup apple butter and egg to remaining mixture. Beat on medium speed until smooth and creamy. Spread evenly into pan. Bake 20 minutes.
Place caramels, 2 TB butter and remaining apple butter in microwavable bowl. Microwave on high 3-4 minutes, stirring every 30 seconds until smooth.
Pour caramel mixture evenly over partially baked crust. If caramel has set, microwave 1 minute until pourable.
Combine walnuts, coconut and 2 TB melted butter with reserved cake mix mixture. Mix until crumbly.
Break up topping and sprinkle evenly over caramel. Bake 16-18 minutes. Cool completely before cutting into bars.