your recipe and the way you explain every step is perfect. Only the baking time/temperature does not seem to work properly. They came out overbaked with a slighty black (=burnt) base.
I placed the tray on the lowest postition, like you recommend/say in the recipe.
I put the brownies in a air tight container overnight, hoping they migh develop some softness. The next day they were even harder, like very old bread. Fail.
My oven is a basic oven, electricity, constant accurate temperature, no convection, no circulating air or similar.
Could it be that your 350 F aren't "true" 350 F, but more like 330-340F?
My old oven used to be cooler than the number on the knob promised.
I will give it another try, bake only for 25 Min at 330 and see how they turn out.
I still give this recipe three stars, mainly because I don't want to ruin your good overall rating and secondly because I really enjoy your writing. Only the outcome was a disappointment.
Maybe I should mention I did not substitute or replace any of your ingredients. This can't be the reason for the failure either.