Oh, so yummy and so easy to make. The recipe here comes from the 1983, 12th edition of the Fannie Farmer Cookbook: 3 oz (85g) unsweetened chocolate, 6 T butter, 300 g sugar, 3 eggs, 1/4 T salt, 105 g flour and 1.5 teaspoons vanilla, mixed then baked for 40 min at 350 oven. Be sure and butter the pan-9 in square, before you start. I have skipped the nuts since some in my family do not like brownies with nuts. Cool for about 15 minutes then cut into 16 in squares.
Yes, there are a lot of cookbooks out there, but the Fannie Farmer Cookbook is one of my favorites. My 1983 version has become ragged, but I still use it today. Too bad there are not new editions published. Mine and the most recent version (published in 1996) was written by Marion Cunningham who died in 2012 at the age of 90.