Modified from Martha Stewart’s Recipe:
1 cup all-purpose flour
1/2 cup unsweetened Dutch-process cocoa powder
1/2 teaspoon baking soda
1/2 teaspoon coarse salt
1/2 pound good-quality milk chocolate, 4 ounces coarsely chopped and 4 ounces cut into 1/4-inch chunks
1/2 cup (1 stick) unsalted butter
1 1/2 cups sugar
2 large eggs
1 teaspoon pure vanilla extract lor black walnut extract
1/4 teaspoon instant expresso (optional)
1/2 cup finely chopped black walnuts
1.Preheat oven to 325 degrees. Whisk together flour, cocoa powder, baking soda, and salt; set aside. Melt 4 ounces coarsely chopped chocolate with the butter in a small heatproof bowl set over a pan of simmering water; let cool slightly.
2.Put chocolate mixture, sugar, eggs, and vanilla in the bowl of an electric mixer fitted with the paddle attachment. Mix on medium speed until combined. Reduce speed to low; gradually mix in flour mixture. Fold in chocolate chunks.
3.Using a 1 1/2-inch ice cream scoop, drop dough onto
parchment-lined baking sheets, spacing 2 inches apart. Bake until cookies are flat and surfaces crack, about 12-13 minutes (cookies should be soft). Let cool on parchment on wire racks. Cookies can be stored between layers of parchment in airtight containers at room temperature up to 3 days.