Step 1

Line an 8-inch square baking pan with foil allowing the excess foil to extend over the rim of the pan at two opposite sides by 2 inches. Spray with nonstick spray.

Step 2

Combine the semisweet chocolate, unsweetened chocolate, and condensed milk in a large saucepan and set over low heat. Cook, stirring, until the chocolate is melted and the mixture is smooth, about 5 minutes. Remove the saucepan from the heat; stir in the walnuts, vanilla, and salt.

Step 3

Turn the mixture into the prepared pan and spread evenly. Let cool completely Lift the fudge from the pan using the foil as handles. With a long, thin knife, cut the fudge into 6 strips, then cut each strip crosswise into 8 pieces.

Step 4

Serving size: 1 piece