Place melted butter in a 9 x 13 baking pan. Spread graham cracker crumbs over top. (I actually prefer to melt my butter in the microwave, mix in the graham cracker crumbs and then pat into the pan. It makes a more even bottom crust, I think.).
Layer the coconut and chips in order given. Pour sweetened condensed milk over all. Top with nuts. DO NOT mix together.
Bake at 350°F for 25 minutes or until lightly browned. (Please check earlier if your oven runs hot!).