Prepare the ingredients: measure out the almond flour, powdered sugar, and egg whites.
In a bowl, combine the almond flour and powdered sugar. Sift the mixture through a fine-mesh sieve to remove any lumps.
In a mixing bowl, begin whipping the egg whites until they form soft peaks. Gradually add the granulated sugar, continuing to whip until stiff, glossy peaks form.
Gently fold the almond flour-powdered sugar mixture into the whipped egg whites. Be careful not to overmix, to avoid deflating the meringue.
Transfer the batter to a piping bag and pipe even circles onto a baking sheet lined with parchment paper to create the perfect macaron shape.
Let the piped macarons rest at room temperature for 30-60 minutes, allowing a thin skin to form on the surface.
Preheat the oven to 300°F (150°C) with convection, then bake the macarons for 12-15 minutes. The bottoms should easily release from the parchment paper.
For the coconut filling, melt the white chocolate over a double boiler, then stir in the butter, heavy cream, and shredded coconut.
Mix the coconut-white chocolate ganache until smooth, then let it cool completely.
Fill the cooled macaron shells with the coconut ganache, then top with another macaron shell to create a sandwich.
Let the finished macarons rest for an hour or two to allow the flavors to meld together.
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