3 cups confectioners' sugar
3/4 cup Dutch-process cocoa powder (spooned and leveled)
1/2 teaspoon coarse salt
5 ounces bittersweet chocolate, chopped
1 1/2 cups chopped pecans (or other type of nut)
4 large egg whites, room temperature
Preheat oven to 325 degrees. In a large bowl, whisk together sugar, cocoa, and salt. Stir in chocolate and pecans. Add egg whites and stir just until incorporated (do not overmix). Drop dough by 1/4 cupfuls, 3 inches apart, onto two parchment-lined rimmed baking sheets. Bake until cookie tops are dry and crackled, about 25 minutes, rotating sheets halfway through. Transfer sheets to wire racks and let cookies cool completely.