Sift flour, cocoa, and baking soda together.
Beat butter and both sugars together until soft, creamy, and homogenous. Beat in salt and vanilla. Add all dry ingredients and mix until dough forms big, moist curds. Toss in chocolate pieces, mix until incorporated.
Knead the dough to bring it together. Divide dough in half, form two logs 1 1/2 inches in diameter. Wrap logs in plastic, freeze for at least two hours or refrigerate for at least three hours.
Center rack in the oven, preheat to 325 degrees. Line two baking sheets with parchment paper. With a long sharp knife, slice dough into 1/2 inch thick rounds (if they fall apart, just form them back into a circle on the baking sheet). Bake for 12 minutes. Transfer baking sheet to a cooling rack

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