1 (12-ounce) can evaporated milk
4-1/2 cups granulated sugar
3 cups semisweet chocolate chips
1 cup butter
3 tablespoons vanilla extract
Cook milk and sugar until it comes to a boil, stirring constantly, let boil 6 minutes.
Add chocolate chips, butter and vanilla, stir well until all is blended.
Add a cup of chopped nuts if desired. Pour into buttered pan, and let cool before cutting into squares.
Makes 50 pieces.