Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

In a large mixing bowl, whisk together the egg whites, melted unsalted butter, granulated sugar, brown sugar, and vanilla extract until well combined and slightly frothy.

In another bowl, sift together the all-purpose flour, baking soda, and salt.

Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.

Fold in the semi-sweet chocolate chips until evenly distributed.

Scoop about 1.5 tablespoons of dough onto the baking sheets, spacing them 2 inches apart.

Bake for 10 to 12 minutes until edges are lightly golden.

Let the cookies cool on the sheets for about 5 minutes before transferring them to a wire rack.