I found a Nigel Slater book (The Kitchen Diaries) at the library with a recipe for the richest, most chocolatey brownies I have yet tasted.
The recipe is also available online here. If you would like the substitutions for the ingredient amounts, this is what I used:1 1/3 cup sugar
1/2 lb butter
2 T butter
9 oz chocolate pcs. (70% cocoa solids)
3 lrg eggs + 1 egg yolk
1/2 cup flour + 2 T flour
1/2 cup cocoa + 2 T cocoa
3/4 tsp baking powder
Oven 350 degrees
Enjoy!
[Warning: One brownie has 327 calories, 82% of which are from fat]