Heat oven to 350 Mix cake mix (dry) softened butter,
and egg until mixture reaches a crumb texture .
Reserve 1 1/2 cups of the crumb mixture. Press the remaining crumb mixture in a 13x9x2 inch pan sprayed with non-stick cooking spray .Bake until crust appears dry ,10 to 12 minutes .Cool for 10 minutes .
Heat butter, milk, and caramels over low heat , stirring occasionally until caramels are melted.
Pour caramel mixture over crust sprinkle with the nuts ,chocolate chips and reserved crumb mixture .
Bake until crumb mixture appears dry and begins to brown 25 to 30 minutes. cool Loosen edges of bars with spatula .Refrigerate until caramel mixture becomes firm about 1 hour. Cut into 2x1 1/2 inch bars .
you may replace the nuts with butterscotch chips