Preheat your oven to 350°F (175°C).
Line your baking sheet with parchment paper.
In a mixing bowl, beat the egg whites until frothy, about 2-3 minutes.
Sift together powdered sugar, cocoa powder, and salt in another bowl.
Fold dry ingredients into frothy egg whites and add vanilla extract.
Fold in chocolate chips until the batter is smooth.
Scoop heaping tablespoons of dough onto the prepared baking sheet.
Bake for 10-12 minutes, until edges are set and centers are fudgy.
Let cool briefly on the baking sheet, then transfer to a wire rack.
