Now this is all my opinion, this is who I think can cook and such from living style and how we proceed in games

Altiar- I see him at college student level, due to the fact we see him always moving, I don't think he has time for cooking, just what he needs kinda deal, nothing fancy just get you through the mission type of deal
Here is a Altair example

Malik- same as Altair only more fancy about it like this

Ezio- this man is a cooking god send, you best expect some full course Italian meals, this man will spoil you with the best Italian food when he is not on a quest, and even then I think he will find a way to eat well when traveling ( you would get fed better then me )

Conner- exotic? He can cook a lot of stuff he hunts, he also could poison you if he wanted to or has too but he won't, if he doesn't hate you ( yes you lee )

Haythem- he can probably cook very well being a Templar, and not having to do assassin missions, he would probably poison you just because

Edward- this poor soul means well but you may die or get food poisoning, I don't think it would be very wise to let him cook unless your helping him, I think with practice he could but would mostly be a helper not a man chef of the house


part two VVVVVV

Continuing from part 1

Arno- he probably follows ezio and his cooking abilities only French

Avaline- she could probably cook pretty well, like regular dinner type of gal with some skill in certain foods, she Could poison you, could

Shay- ok he probably has his hidden talents in some cooking, maybe more Irish, maybe more common foods of he had the stuff to make it , but I'm pretty sure if he had to go into the kitchen and make something out of what's there we would be met with good tasting but odd looking food, but hey it's not poisoned so that's good? Right? Hey reader you ok there? Your looking pale

Jacob- do not let him anywhere close to that kitchen it's actually said in the game by Evie * coughs and says with a strained voice* "it smells like Jacobs cooking"
So this man.. clearly has some issues in the kitchen
I'm sure he can mix the ingredients but no main cooking

Evie- the British god send, this lady can make you anything, she is the British ezio
If only her twin had that skill

Desmond- the cooking skills did not pass down, your looking at Altair level cooking, in sure if they got together they could make something right?