Preheat your oven to 350°F (175°C).
Grease your 9x13-inch baking pan with some butter or non-stick spray.
In a large mixing bowl, combine the melted butter and the graham cracker crumbs. Press firmly into the bottom of your prepared baking pan.
Spread the semi-sweet chocolate chips evenly over the graham cracker crust.
Sprinkle the peanut butter chips over the chocolate layer.
Evenly distribute the sweetened shredded coconut flakes on top.
Scatter the mini peanut butter cups over the coconut layer.
Drizzle two-thirds of the sweetened condensed milk over the entire creation.
Drop spoonfuls of creamy peanut butter over the top and spread it out gently.
Place the pan in the preheated oven and bake for approximately 25-30 minutes.
Once baked, let it cool completely before cutting into squares or bars.