Heat 1/3 cup of butter in a bowl in the microwave with 2 squares unsweetened chocolate for 40 seconds, remove from microwave and stir until melted.
1 cup sugar
½ tsp. vanilla
¾ cup flour
¼ tsp. salt
½ to ¾ cup coarsely chopped walnuts or pecans.
Stir well, pour into a greased 8 inch square pan, bake at 375 for 25 minutes.
This recipe comes from my old spattered copy of Peg Bracken's Appendix to the I Hate to Cook Book. It was first published in 1966 before we all had microwaves, so you can see that I've changed the recipe a bit.