It's interesting that in the late 60s and early 70s, Harvey Comics merchandising was at its peak and quite a few interesting products were issued including this short-lived cookie line.
I'm not actually sure if these did indeed make it to the marketplace, but I do own a copy of the box that features Spooky up above. If they were around, it may have been in limited areas of distribution, too.
In any case, I would love for stuff like this to make a come back, it's just that no one seems to value anything Harvey these days, despite them being fondly remembered characters.
It's the old song and dance that no one seems to know how to MARKET these characters. If I owned them, I would, but I don't have $60 million to buy them.
Basically, the easiest way to reintroduce the Harvey characters is with a digest line reprinting the old stories and also tie them into various holidays, like Casper for Halloween, Little Lotta for Thanksgiving, Hot Stuff for Valentine's Day, Richie Rich for Christmas, etc. At least Dark Horse has been reprinting things, so it's a start.
Anyway, once the association is established, then products like this could be re-introduced.