Preheat your oven to 325 degrees. Spray a 13X9 baking dish with non-stick cooking spray and set aside.
In a food processor, add the macadamia nuts. Process until finely chopped. Next, add 2 cups all-purpose flour, powdered sugar, and kosher salt.
Process until blended. Add the cold, cubed butter and pulse the mixture until crumbly.
Take the mixture and press it into the bottom of the prepared baking dish. Bake for about 15 to 20 minutes or until lightly browned on top.
Wipe your food processor clean. Next, add the mango and orange marmalade. Process until smooth.
Add the granulated sugar and 1/4 cup all-purpose flour. Pulse until combined. Add the eggs and lemon zest and process until everything is well combined.
Pour the mixture on top of the prepared crust. Sprinkle the mango mixture with shredded coconut.
Bake for about 25 minutes or until golden brown. Cool completely before slicing into bars.