translation has to be "more cooks". several translates to många, and more - the comparativ- to fler(a)
I think you're mixing up "fler" (more) and "flera" (several). Many Swedes mix these up as well, but we try to keep them apart in the course.
Are there separate words for cook and chef? And do they carry different meanings? In American English, a chef is usually considered more capable than a cook.