01 - Preheat the oven to 340°F and line a baking sheet with parchment paper.
02 - Whisk together egg whites, sugar, vanilla extract, and salt in a large bowl until frothy.
03 - Fold in shredded coconut until fully incorporated.
04 - Using a tablespoon or small cookie scoop, form mounds of the mixture and place them ¾ inch apart on the prepared sheet.
05 - Bake for 18 to 20 minutes or until edges turn golden brown.
06 - Transfer to a wire rack and allow to cool completely.
07 - Gently melt dark chocolate and optional coconut oil in a heatproof bowl set over simmering water, stirring until smooth.
08 - Dip bottoms of cooled macaroons into melted chocolate, letting excess drip off, then place back on parchment-lined sheet.
09 - Refrigerate for 15 to 20 minutes until chocolate firm.