Simple answer, no. Feeding your cat peanut butter is not a good idea. Peanut butter mainly contains proteins and carbohydrates along with a high level of fat that could negatively affect your cat.
Another risk factor for cats is the fact that they are “obligate carnivores” by nature and rely on animal products to give them the required nutrients,that is why meat is generally considered to be something that cats would consume more.
This also means that cats will have trouble digesting plant or any other sort of vegetarian matter as compared to when the food is meaty. Basically, your cat won’t receive the amino acids and such as needed for their bodies if they went purely green and decided to sustain themselves on vegetables.
Now, peanut butter is not an animal product, hence your cat will have a tougher time digesting it.
Although it might be possible to perhaps once in a blue moon give your cat a spoonful of peanut butter, that is only if you have a cat with a naturally strong and healthy. Otherwise, feeding a weak cat even a spoonful of peanut butter could prove to be toxic and ultimately fatal.
Can cats eat peanut butter? Not a likely scenario to think about as it could be troublesome to handle if your cat gets an allergic reaction to it.
Check this article to learn can dogs eat peaches.