4 1/2 c. sugar
1 (13 oz.) can evaporated milk

Mix and let come to a boil. Stir for 6 minutes, remove from heat. Add:

1 lb. butter
3 (6 oz.) pkgs. chocolate chips
3 tsp. vanilla
2 c. walnuts (optional)

Beat with mixer until thick. Pour into a buttered 9 x 13 inch pan. Cut when cool.