I made these brownies in April, not because of Halloween (obviously), but because I was looking for a Baker's one-bowl recipe with no nuts in it.
These are easy, fast and simply excellent: moist, dense and very very chocolatey. If you use the white chocolate drizzle in a decorative pattern that does not make a spider web, there is no way to tell these are meant for Halloween.
This will be my number one recipe choice for a nut-free brownie from now on.