01 - Preheat oven to 340°F and line a baking sheet with parchment paper.
02 - Whisk egg whites, sugar, vanilla extract, and salt in a large bowl until frothy.
03 - Add shredded coconut to the mixture and stir until fully combined.
04 - Form mounds using a tablespoon or small cookie scoop and place them 3/4 inch apart on the prepared sheet.
05 - Bake for 18 to 20 minutes until edges turn golden brown.
06 - Transfer macaroons to a wire rack and allow to cool completely.
07 - Melt dark chocolate with optional coconut oil in a heatproof bowl over simmering water, stirring until smooth.
08 - Dip the bottom of each cooled macaroon into the melted chocolate, letting excess drip off. Place onto parchment-lined sheet.
09 - Refrigerate for 15 to 20 minutes, or until the chocolate coating is firm.