See's Fudge Recipe

1/2 cup (1 stick) butter, cut into 4 pieces, plus more for preparing pan
1 (6 oz.) pkg. semisweet chocolate chips
1 tsp. vanilla extract
2 cups sugar
1 (5 oz.) can evaporated milk
10 large marshmallows
1 cup chopped nuts

Lightly butter an 8-in. square baking pan and set aside. Combine the butter, chocolate and vanilla in a bowl. Set aside.

Place the sugar, evaporated milk and marshmallows in a saucepan. Bring to a boil over medium heat, stirring frequently. Reduce the heat to low and cook, stirring constantly, until the marshmallows have melted and the mixture has thickened a bit, about 6 minutes.

Pour the hot mixture over the ingredients in the bowl. Beat with an electric mixer until the fudge is thick and dull, 4 to 5 minutes. Stir in the nuts.

Pour into the pan. Refrigerate several hours to firm, then cut into 24 pieces.