Preheat your oven to 350F (175C) and lightly butter the sides and bottom or a 9x13 baking dish. Set aside.
Combine graham cracker crumbs and melted butter butter in a bowl and use a fork to stir until well-combined. Pour into the bottom of your prepared pan and use the clean bottom of a measuring cup to tamp into the bottom of pan
1 ½ cups graham cracker crumbs, ½ cup salted butter
Pour chocolate chips, then butterscotch chips, then chopped nuts, evenly over the graham cracker crust layer.
1 cup semisweet chocolate chips, 1 cup butterscotch chips, 1 cup chopped walnuts or pecans
Drizzle ingredients in pan evenly with sweetened condensed milk.
14 oz sweetened condensed milk
Evenly sprinkle coconut over the condensed milk.
1 ½ cups sweetened shredded coconut
Transfer to oven and bake 350F for 25 minutes or until coconut is turning lightly golden brown.
Allow bars to cool several hours before cutting -- this will allow the chocolate to firm up and make them easier to cut. If you cut them sooner they'll be quite messy (but still delicious!)