Preheat oven to 350°. Melt butter in a 9-in. square baking pan. On top of melted butter, sprinkle crumbs, then coconut, then chocolate chips, then nuts. Pour milk over all. Do not stir. Bake until a toothpick inserted in center comes out clean, about 30 minutes. Cool several hours before cutting.
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These are called Magic Cookie Bars. The recipe was on the back of the Nestle's Toll House Morsels bag back in the 1970's.