This is the purist's back-to-basics brownie at its best - just smooth, rich chocolate with no nuts or other distractions. You can even skip the glaze, if you like.
Remove brownies from the oven while they are still barely moist in the center. They will continue to firm up as they sit on the countertop.
Brownies freeze very well. Wrap them individually in plastic wrap, then pop a bunch into a heavy-duty freezer bag. Defrost in the microwave for a quick cure when the next chocolate emergency strikes.