Disclaimer: I’m not a pastry chef. I’ve baked these many times, and I’m always happy with the results but I’ve just written up the recipe – including the metric conversion. Please let me know if you spot any typos. 🙂
Some visuals:

Step 2:

Step 7:

Step 8:

Step 10:

I’ll cut the individual squares into four and add them to my Christmas baking gift boxes. The brownies are crusty on the edges and densely chewy on the inside. I’ve served these with vanilla ice cream, and a swirl of caramel or fudge sauce. But they’re awesome on their own.
Enjoy!