In a medium bowl, combine the melted butter with the salt and graham cracker crumbs. The texture should resemble wet sand.
Layer chocolate chips, butterscotch chips, pecans, and walnuts over the graham cracker layer. Pour condensed milk over everything in an even layer.
Sprinkle the coconut on top and bake in the preheated oven for about 25 to 30 minutes or until lightly golden.