Sift flours, baking soda, baking powder + salt into a bowl. Set aside.

Using a mixer fitted with paddle attachment, cream butter + sugars together until very light, about 5 minutes.

Add eggs, one at a time, mixing well after each addition.

Stir in the vanilla.

Reduce speed to low, add dry ingredients + mix until just combined, 5 to 10 seconds.

Drop chocolate pieces in + incorporate them without breaking them.

Press plastic wrap against dough + 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 oven to 350 degrees. Line a baking sheet with parchment paper or a nonstick baking mat. Set aside.

Scoop 6 3 1/2-ounce mounds of dough (the size of generous golf balls) onto baking sheet, making sure to turn horizontally any chocolate pieces that are poking up; it will make for a more attractive cookie.

Sprinkle lightly with sea salt + bake until golden brown but still soft, 18 to 20 minutes.

Transfer sheet to a wire rack for 10 minutes, then slip cookies onto another rack to cool a bit more.

Repeat with remaining dough, or reserve dough, refrigerated, for baking remaining batches the next day. Eat warm, with a big napkin.