How do I convert AVCHD into MP4?

Ok, so I know all about how you have to import the whole file structure into Premiere Pro so you can use AVCHD directly in Premiere. But how do I convert AVCHD to .MP4? Do I seriously have to import each video into premiere, create seperate sequences, and then export again?

Is there an easy batch way to do it in AME? Or alternatively in Premiere?