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ift flours, baking soda, baking powder and salt into a bowl. Set aside.
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Using a mixer fitted with paddle attachment, cream butter and sugars together until very light, about 5 minutes. Add eggs, one at a time, mixing well after each addition. Stir in the vanilla.
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Reduce speed to low, add dry ingredients and mix until just combined, 5 to 10 seconds. Drop chocolate pieces in and incorporate them without breaking them.
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Press plastic wrap against dough and refrigerate for 24 to 36 hours. Dough may be used in batches, and can be refrigerated for up to 72 hours.
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When ready to bake, preheat oven to 350 degrees.
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Line a baking sheet with parchment paper or a nonstick baking mat. Set aside.
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Scoop 6 3 1/2-ounce mounds of dough (the size of generous golf balls) onto baking sheet.
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Sprinkle lightly with sea salt and bake until golden brown but still soft, 18 to 20 minutes.
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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.