Preheat the oven to 350°F. Place the butter in a 9" x 13" inch pan. Place the pan in the oven while the oven is preheating. * Once the butter is fully melted remove the pan from the oven and set aside.
Sprinkle the graham cracker crumbs over the melted butter. Using a spoon, mix the graham cracker crumbs into the butter. Once combined, press the graham cracker mixture into an even layer in the bottom of the 9"x13" pan.
Sprinkle the shredded coconut evenly over the graham cracker crust.
Sprinkle the chocolate chips over the coconut.
Evenly distribute the butterscotch chips over the chocolate chips.
Sprinkle the chopped walnuts over the butterscotch chips. **
Pour the can of sweetened condensed milk over the entire pan and its contents, being careful not to let all of it pool in one area.
Bake at 350°F for 20 minutes. Or until the edges are slightly browned. Remove from oven. Let cool. I let mine cool at room temp for a bit, then pop it into the fridge to speed up the setting process. Once the bars are set, eat and enjoy!