Interesting! But not my experience. Before seeing your post, yesterday I made 2 different batches of brownies, with two different recipes. The first recipe used oil instead of butter and cocoa powder without any additional chocolate. Shiny crust (my first ever!). Recipe #2 used cocoa powder AND chocolate + chocolate chips and butter rather than oil. Completely dull, flat top - no shiny crust to be found (richer flavor, though, so still a win). Interesting that this is your experience. Not true for all recipes, though, apparently.

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