Preheat oven to 350°F.
Place butter in 9×13 pan and place in oven as it preheats until it melts (2-4 minutes). Remove from oven.
Pour in graham cracker crumbs. Mix with fork. Pat into crust on bottom of pan.
Pour chocolate chips over crust. Sprinkle butterscotch chips, then coconut, and finally nuts over mixture. Drizzle condensed milk over whole mixture.
Bake 25-30 minutes.
Let cool completely before cutting into bars. The corners bars are sometimes hard to get out of the pan, but the rest will come out easily.
Freezes well!