An arranged employment offer can be for any occupation, as long as it's NOC 0, A or B. Cooks and chefs would be NOC B. So you don't have to worry about the occupation not being on the list of eligible occupations, as that list applies to applications that don't have an arranged employment offer.
Since you're already here on an IEC visa, for arranged employment you just need a job offer letter from your employer that is written on company letterhead and signed by someone with hiring authority; it should mention that the job will be permanent, full time and non-seasonal; it has to list the job duties; also the wage and hours per week, and these have to be in line with normal wages and hours for the job in the same region; etc.
There should be details on the FSWP instruction manual on CIC's website regading what the letter should cover. Scroll down to the Arranged Employment section: http://www.cic.gc.ca/english/information/applications/guides/EG7TOC.asp
Also, seek suggestions in the Skilled Worker category of this forum as those will be your potential fellow applicants. http://www.canadavisa.com/canada-immigration-discussion-board/skilled-worker-professional-immigration-b4.0/
There is one potential difficulty - your work permit must be valid both when you apply for PR and when you receive the PR visa. I believe you're on a 6 month WP? That gives you very little time to work with. You can apply for a bridging open WP (BOWP) after you submit your PR application and get an Acknowledgement of Receipt (AOR). This BOWP may be for one year, which would solve the problem I guess. Check with others on the Skilled Worker forum.
Don't forget the Federal Skilled Trades Program - this might be an easier option as this program has pass/fail criteria, as opposed to FSWP which requries that you obtain 67 points in order to qualify. Your IEC visa will allow your employer to give you a one year job offer, and with that, you can apply under FSTP. You can apply for a BOWP here too. http://www.cic.gc.ca/english/immigrate/trades/employment.asp