2 tablespoons butter
2/3 cup evaporated milk
1 1/2 cups granulated sugar 
1/2 teaspoon salt
2 cups miniature marshmallows
1 1/2 cups semisweet chocolate chips
1 teaspoon vanilla extract
1/2 cup chopped walnuts

Put butter, milk, sugar and salt into saucepan over medium heat. Bring to a boil. Boil 5 minutes, stirring constantly.

Remove from heat; add remaining ingredients, then stir with a spoon for 1 minutes. Marshmallows should be melted. Pour into a greased 8-inch square pan. Cool and cut into squares.