[Like all sapient beings, Lup has the right to be wrong about brownies. That's probably a law or something.]

Not entirely random, if you layer them in properly, you can get a more even and regular spread throughout.

Though, I've noticed most humans seem to prefer less texture when I'm baking for them than other spider monsters do? I wonder if it might be a species difference- if nothing else, the shape of the teeth might be a factor in enjoyment, there...

[Those are some pretty sharp fangs she's got there.]