Weigh out the ingredients
I
You'll need flour, unsalted butter, egg yolks, cream of coconut, key limes, coconut flakes, powdered sugar, sweetened condensed milk, heavy cream, vanilla extract, sugar, and salt.
Make the shortbread
II
Cream butter and sugar, then add powdered sugar, vanilla, and salt. Add flour, then fold in the coconut flakes. Press dough into pan, chill for 30 min, dock the crust, then bake for about 30 minutes. Set aside to cool.
In a large bowl, whisk the egg yolks until frothy. Add the 15 ounces of cream of coconut, sweetened condensed milk, and key lime juice, and whisk until fully combined.
Make the filling
III
Pour filling over the cooled crust and bake for about 30 minutes or until the edges are bubbling and just barely starting to turn golden. Let bars cool completely at room temperature, then transfer to the fridge to chill uncovered overnight.
Bake & chill
IV
Use an electric hand mixer to beat heavy cream and sugar until medium peaks form. Cut the bars into squares, then add a dollop of whipped cream to each bar. Garnish with key lime zest and coconut flakes, and enjoy!
Decorate
V