Preheat your oven to 350°F (175°C).

Grease a 9x13-inch baking pan with non-stick spray or line it with parchment paper.

In a mixing bowl, combine melted unsalted butter with graham cracker crumbs until fully incorporated. Press this mixture evenly into the bottom of the prepared baking pan.

Sprinkle the shredded coconut over the crust, followed by the semi-sweet chocolate chips and butterscotch chips, then toss in the chopped walnuts.

Drizzle the sweetened condensed milk generously over the layered mixture.

Bake for 22-28 minutes until the edges turn golden brown.

Remove from the oven and let cool for at least 3 hours before slicing into bars.