Preheat oven to 350F and grease and flour a 9x13-inch baking pan.

Place caramels and 1/3 cup evaporated milk in a saucepan and melt slowly over low heat.

In a large mixing bowl, combine the remaining 1/3 cup evaporated milk, melted butter, cake mix and nuts.

Spread half of the cake mixture in the prepared pan and bake for 6 minutes. While hot, sprinkle chocolate bits on top. Spread melted caramels over the bits and crumble the remaining cake mixture over the caramel.

Bake for another 20 minutes or until done. Cool and cut into squares.