Cut butter into pats and place in a 13x9-inch baking dish. Melt in a preheated 350°F oven (about 2-3 minutes).
Sprinkle graham cracker crumbs over melted butter; press into bottom of pan.
Sprinkle with chocolate chips, butterscotch chips and walnuts. Pour sweetened condensed milk evenly over layers. Sprinkle with coconut.
Return to oven and bake 25-30 minutes or until edges are golden brown. Remove from oven and allow to cool completely.