Hope this is what you are looking for! It is from the Better Homes and Gardens Cookbook.

Melt butter in 13x9x2-inch pan. Sprinkle crumbs evenly over butter. Layer with chocolate and butterscotch chips, coconut and nuts. Pour milk over all. Bake at 350 deg. For 30 minutes. Cool. Cut in bars.

I have made these using 2 Cups chocolate chips and omitting the butterscotch chips altogether. I like both ways.