Ingredients:
- 10 tablespoons (140 grams) unsalted butter
- 1 1/4 cups (250 grams) granulated sugar
- 3/4 cup plus 2 tablespoons (65 grams, may vary by brands) unsweetened cocoa powder (natural or Dutch-process)
- 1/4 teaspoon salt (or a heaping 1/4 teaspoon flaky salt, as I used)
- 1/2 teaspoon pure vanilla extract
- 2 large eggs, cold
- 1/2 cup (65 grams) all-purpose flour
- 2/3 cup (75 grams) walnut or pecan pieces (optional)