Coconut Lime Squares

Preheat oven to 325 F. Spray an 8-inch square baking pan with nonstick cooking spray. Line the pan with aluminum foil, leaving an overhang on opposite sides to lift the squares out afterward. Spray the foil with nonstick cooking spray.
To make the crust: Combine the flour, butter, coconut, confectioners' sugar and salt in the bowl of a stand mixer fitted with the paddle attachment. Beat on low until the butter is cut into the dry ingredients, and the mixture resembles coarse crumbs. Transfer to the prepared pan and press into an even layer to make the crust. Bake for 25-30 minutes, or until the crust is golden brown.
Remove the pan to a wire rack and lower the oven temperature to 300 F.
To make the filling: Whisk the egg and sugar together in a medium bowl until well combined. Add the flour, lime juice and lime zest and continue whisking until completely incorporated. Pour the mixture over the warm crust and transfer to the oven. Bake for 20 minutes, then remove the pan from the oven. Sprinkle the top of the bars with the toasted coconut and continue baking for an addition 5-10 minutes, or until the filling is just set. Transfer the pan to a wire rack and allow the bars to cool in the pan. Cover the pan loosely with plastic wrap and refrigerate for at least 1 hour before cutting into squares (I would even recommend letting them sit in the fridge overnight. It makes them super easy to cut the next day).