I got a strange, but interesting as for a full peanut production line
I don't know if it's because I've been watching Factorio on YouTube or not, because I have not been searching for peanut butter. But anyway, so that's how you do it.
Making peanut butter is super simple and very friendly to automation. Just add peanuts + salt and grind. If you grind with enough friction it will become liquid and you can just pour it into jars. Factory modifications to make it last longer or use byproducts are just changes to the inputs.