Many plants are toxic to cats. But some vegetables and treets are poisonous too. Be aware that your cat is not eating any of the food which you are cooking.

Here is a list of some common dangerous food:
 
 
Chocolate
Coffee
Walnuts

Salt

 Also: Alcoholic beverages, Apple seeds, Apricot pits, Cherry pits, Hops, Macadamia nuts, Moldy foods, Mustard seeds, Peach pits, Potato leaves ans stems (green parts), Rhubarb leaves, Tea (caffeine), Tomato leaves ans stems (green parts), Avocados (toxic to birds, mice, rabbits, horses, cattle and dairy goats), Yeast dough.

 
 
   
Onions & onion powder
Mushrooms