I finally found a promising recipe in my copy of Alice Medrich’s Sinfully Easy Delicious Desserts. It was a thinner brownie than I wanted, but it looked dark and delicious and had the most magnificent shiny, crackly top. The recipe contains a fair amount of butter, as legit brownies should, and the butter is browned before the addition of sugar and cocoa powder. If you’re going to put a lot of butter in something, you might as well brown it for extra flavor.
Alice’s recipe also called for a lower-than-usual baking temperature (325 degrees) and specified that the brownies be baked in the lower third of the oven. All of the chocolate flavor came from cocoa powder, too. Interesting.