Preheat your oven to 350 degrees Fahrenheit.
In a small bowl, combine the 1 1/2 sticks melted butter and 2 cups graham cracker crumbs until combined.
Grease the bottom of a 13x9x2 glass pan. Then pour the graham cracker crumb mixture into the bottom pan, patting them down until a crust forms.
Sprinkle 1 cup chocolate chips, 1 cup butterscotch chips, 1 cup coconut, and then 1 1/2 cups walnuts on top of the crust, in that order.
Drizzle 14 oz sweetened condensed milk over the top of the bars.
Place the pan in the oven and bake for 25 minutes until the edges start to turn brown and bubbly.
Allow the bars to cool for 10-20 minutes at room temperature, then put the pan in the refrigerator to allow the Hello Dolly Bars to cool completely before cutting. Enjoy!