Preheat the oven to 325°. Spray 9x9 pan with nonstick coating, set aside.
In a large mixing bowl add the graham cracker crumbs, flour and salt. Whisk to combine.
Add the sweetened condensed milk and vanilla extract. Stir until everything is evenly combined.
Fold in the remaining ingredients - chocolate chips, chopped pecans and shredded coconut.
Spoon into the prepared baking pan and spread evenly. Bake in the preheated oven for 38-40 minutes until golden brown and the sides just begin to pull away from the pan.
Remove from the oven and cool for 10 minutes. While still warm, cut into bars. Let cool completely before serving. Dust with powdered sugar, if desired.
Notes
Storage: Store the cookie bars in an airtight container at room temperature for up to 4 days.