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Set the oven at 350 degrees. Line 2 baking sheets with parchment paper.
In a medium bowl, whisk together the flour, salt, baking soda, and baking powder.
In an electric mixer fitted with the paddle attachment, cream the sugars and butter for 5 min or until fluffy.
In a bowl, beat the eggs and extra yolk just to mix them.
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With the mixer on medium speed, add the egg mixture and vanilla. Mix until well combined, scraping down the sides of the bowl with a spatula once or twice. Add the flour mixture and beat until combined. Remove the bowl from the mixer stand. With a rubber spatula, fold in the chocolate.
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