15-Minute Chocolate Walnut Fudge

Name: 15-Minute Chocolate Walnut Fudge
Prep time: 10 min
Cook time: 5 min
Total time: 15 min
Yield: {2½ pounds|1.1 kg} (36-64 squares, depending on how large you cut them)
Ingredients: 16 ounces semisweet chocolate, best quality such as Ghirardelli, coarsely chopped; 2 ounces unsweetened chocolate, best quality such as Ghirardelli, coarsely chopped; ½ teaspoon baking soda; ⅛ teaspoon salt; 1 (14-ounce) can sweetened condensed milk; 1 tablespoon vanilla extract; 1 cup coarsely chopped walnuts