History. Your knowledge of cooking techniques allows you to assess the social patterns involved in a culture's eating habits.
Medicine. When administering treatment, you can transform medicine that is bitter or sour into a pleasing concoction.
Survival. When foraging for food, you can make do with ingredients you scavenge that others would be unable to transform into nourishing meals.
Prepare Meals. As part of a short rest, you can prepare a tasty meal that helps your companions regain their strength. You and up to five creatures of your choice regain 1 extra hit point per Hit Die spent during a short rest, provided you have access to your cook's utensils and sufficient food.
Additional uses. You can use your cook's utensils to do a variety of things, as your DM if you may use the tools for a specific task. Examples of such tasks are as follows; Cook typical or gourmet meals, replicate a meal, spot poison or impurities in food.