1 can (14 ounces) sweetened condensed milk, divided
1 cup chopped walnuts, divided
2 teaspoons vanilla extract, divided
1 package (11-1/2 ounces) milk chocolate chips
Line a 9-in.-square pan with foil; grease foil with butter.
In a large heavy saucepan, combine semisweet chocolate chips and 3/4 cup milk over low heat. Remove from heat; stir in 1/2 cup walnuts and 1 teaspoon vanilla. Spread into prepared pan.
In another saucepan, combine milk chocolate chips and remaining milk. Remove from heat; stir in remaining walnuts and vanilla. Spread over first layer. Refrigerate, covered, 2 hours or until firm. Using foil, lift fudge out of pan. Remove foil; cut fudge into 1-in. squares. Store between layers of waxed paper in an airtight container.Yield: about 2-1/2 pounds.