Chef Laraib is the most annoying of all the HoT mastery points. There are plenty of other masteries easier to get. There are also a LOT of players who will help you get the masteries if you ask. Some players/guilds run regular event trains to collect mastery points.
The best times to seek help for alternate mastery points are weekends and days when Crystal Oasis or Desert Highlands are on the Daily Achievement rotation (either events daily or bounty daily will work). There are more veteran players on the maps then, and vet players are the most likely to help out.
Another alternative is to find mastery insights in LWS4 (if you have the episodes unlocked). There are often helpful players who will port you to out of reach mastery points if you ask. Don't worry about running out of Mastery Points, there are far more available than you can spend.
Finally, if you are dead-set on beating Chef Lariab, here's a bit of advice from when I beat the SOB. Learn where the ingredients are. Make sure the chef is targeted (so you don't lose track of him). Be patient. Sometimes he will ask for stuff that is too far apart and you can't keep up, other times he'll ask for the same ingredient 3 times in a row while standing right next to it. His requests and movement are random, so you can get eventually get a lucky run. If you have it, a Speed Booster will help you move faster and keep up with his running around (all other boosts you can give yourself are disabled during the challenge). If you have a friend player a Herald Revenant, ask him to park his character in the area with the Facet of Elements active- this will give you constant Swiftness. But above all, be patient and don't stress out. If you are getting stressed, take a break.