Preheat the oven to 350ºF. Spray a 9x13 baking pan with cooking spray.
In a medium bowl, whisk together the melted butter and brown sugar until combined.
Whisk in eggs and vanilla.
Add the flour, soda, and salt and mix using a rubber spatula, folding until just combined.
Fold in the coconut, macadamia nuts, and chocolate chips. Do not overmix.
Pour into the prepared pan and smooth into an even layer.
Bake until the top is firm and a toothpick inserted into the center comes out with moist crumbs attached, about 25 minutes. Cool in the pan on a wire rack.