Melt 1 1/3 cup dark chocolate chips and 1/4 cup butter in 15 second intervals in microwave. Stir in between.
Whisk 1/2 cup sugar and 2 room temperature eggs.Vigorously mix to incorporate air. Whisk chocolate into sugar.
Sift 2/3 cup flour, 2 tsp cornstarch and 1/2 tsp baking soda into chocolate.
Mix chocolate.
Scoop 2 tbsp sized balls onto baking stone.
Optional: Press chocolate chips into balls.
Bake at 350 for 12 minutes.
Transfer to cooling wrack.
Garnish with salt.