Melt the butter and sugar in a small saucepan on medium heat.
Once the butter is melted, add the shredded coconut and egg whites.
Stir to combine and remove from the heat.
Allow the mixture to cool for 30 minutes in the fridge.
Preheat the oven to 180°C fan (356°F).
Measure the dough into 20-gram balls.
Shape them into rounded cookies and space them out on a lined baking tray.
Bake for 13-14 minutes until golden brown.
Transfer to a wire rack.
Once cool, melt the dark chocolate and transfer it to a small bowl.
Use a toothpick to dip each cookie into the dark chocolate.
Wipe off the excess on the corner of the bowl.
Leave to set on parchment paper.
Repeat with the other cookies.