Preheat the oven to 350° F and line a 13"x9" pan with parchment paper or spray with cooking spray. Melt the butter in the microwave in a microwave safe bowl, or melt in a saucepan on medium heat. Mix the butter with the graham cracker crumbs, and spread the butter-crumb mixture into the prepared pan. Pat the mixture down with the back of the spoon to form an even layer.

In any order you want, top the graham cracker layer with the chocolate chips, peanut butter chips, mini M&m's and Oreos (save a few of everything for the top if you want!). Then, drizzle the entire can of sweetened condensed milk over all of the chips and cookies. Top with the shredded coconut.

Bake for 25-30 minutes, until the coconut looks a little toasted. Top with the remaining chips, Oreos and M&m's if desired. Let cool for about 30 minutes before cutting and serving. Enjoy!