My gal's kitten loves crunchy peanut butter that's given to him as a treat
every few days. Anything bad about that for the kitten's health? Nothing bad
about cat-dietary peanut butter turned up in a Google search, but this
subject has not been discussed much.

I imagine that it's the oil (fat) content of the peanut butter that the
kitten finds to be tasty. After all, cats normally consume more fat than do
humans. Most brands of peanut butter contain not only the oil from peanut,
but also the oils from various tropical plants, which are the highest in
saturated fat.

BTW, I've found that a small addition of canola oil (as a meal ingredient)
can be used to get a cat to eat various dry foods that it would otherwise
refuse. I haven't tried "vegetable oil" yet as a flavor enhancement for a
cat's meal. If you read the ingredients carefully, the oils labeled as
"vegetable oil" are actually soil bean oil.