These are by far the best from-scratch brownies I've ever made, and I've tried several recipes. This one comes from The New Good Housekeeping Cookbook, and they are so delicious. One glance at the ingredient quantities will tell you how rich they are!
1 c butter (2 sticks)
4 squares unsweetened chocolate
2 c sugar
2 c chopped walnuts (optional)
1 c all-purpose flour
1 tsp vanilla extract
1/2 tsp salt
Preheat oven to 350. Grease 13x9 baking pan. In a heavy 3-quart saucepan (I do it in a 2-quart) over low heat, melt butter and chocolate, stirring occasionally. Remove saucepan from heat. With a wire whisk or a spoon, beat in sugar and eggs until well blended. Stir in nuts, flour, vanilla, and salt. Evenly spread batter in pan. Bake 30 to 35 minutes, until toothpick inserted in center comes out clean (I usually leave them in for about 37 minutes).
I often put a couple of handfuls of chocolate chips in, or you could add anything else: white chocolate chips, other kinds of nuts, butterscotch chips, etc. They are so fudgy and rich, they need to be cut into small squares and therefore it's a great recipe for a big group since you can get so many small squares out of a 9x13. Enjoy!