Preheat the oven 365°F. Melt butter onto cookie sheet (must have sides), and then a layer of graham cracker crumbs for crust (may not need a whole half a box).
Spread chocolate chips evenly on top, walnuts (you may not use all the walnuts just use what looks good to you), then the layer of coconut must cover everything. Pour condensed sweetened milk over coconut, make sure it is covered.
It will take about 15-20 minutes to cook but keep an eye on it. It will turn a golden brown and might start bubbling around the edges.