Preheat your oven to 350°F (175°C) and line a 9x9-inch baking pan with parchment paper.

In a food processor, combine flour, macadamia nuts, brown sugar, and lime zest. Pulse until it resembles wet sand. Add butter and pulse until fully incorporated. Press into the pan and bake for 15-20 minutes until golden.

In a mixing bowl, whisk together sweetened condensed milk, lime juice, vanilla extract, and eggs until smooth. Fold in flaked coconut and half of the lime zest.

Once the crust is out of the oven, pour the filling over it and sprinkle with remaining coconut and lime zest, gently pressing them in.

Return to oven and bake for another 15-20 minutes until the filling is set. Let cool at room temperature, then chill in the refrigerator before slicing.

Use parchment overhang to lift the bars and slice into squares. Serve chilled or at room temperature.