In a large bowl, sift together the flours, baking soda, baking powder, and salt. Set aside.
Using a hand mixer or stand mixer fitted with a paddle attachment, cream together the butter, brown sugar, and granulated sugar until pale and fluffy.
Add eggs, one at a time, mixing well after each addition. Stir in the vanilla.
Add dry ingredients into the wet ingredients. Mix until just combined. Drop the chocolate pieces in and mix until well combined.
Press plastic wrap against the dough and refrigerate for 24 to 36 hours. Dough may be used in batches and can be refrigerated for up to 72 hours.
When ready to bake, preheat the oven to 350F/180°C. Line baking sheets with parchment paper or nonstick baking mats.
Scoop 6 3.5 ounces (100 gr) mounds of dough onto the baking sheet. Make sure to turn horizontally any chocolate pieces that are poking up to make a more attractive cookie. Sprinkle with sea salt and bake until golden brown for 18-20 minutes.
Cool on the pans on a wire rack for 10 minutes. Then, transfer the cookies to a rack to cool completely.
Notes
You can use a 6-cm ice cream scoop (about 1/4 cup of dough) instead of weighting each cookie.Use a 5-cm ice cream scoop (1.75 ounces/50 gr) to make smaller cookies and cut the baking time to 13 minutes.Chill the dough for 48-72 hours for the best flavor and texture.I did not use chocolate discs because they were hard to find.