Cooking rules

Hunting checks (Survival Roll):
10 = you find food

15= 1 special material

20= 2 special material

25+= 3 special material

Cooking levels:
Combines with the chef or gourmand feat
Without feat:
Cooking tools check when including a special ingredient:
15= +1 to relevant stats

20= +1 to relevant stats and 1 roll at advantage

25= +1 to relevant stats and all rolls with associated stat at advantage for the day

With feat:
Similar to above but you add the stat modifier of the cook to the relevant stats

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constitution is an outlier. It adds +1 to saves and a scaling hit die of temp hp:
Lvls 1-4 1d4

Lvls 5-9  1d6

Lvls 10-14 1d8

Lvls 15-20 1d10

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COMBINING SPECIAL ITEMS
If you cook with multiple special items that affect the same stat, the bonus increases from +1 to a maximum of +3. If you use special items that affect different stats you subtract 2 from the cooking roll for every different type of material used. You can only use 3 special materials per meal. 

With feat:

No matter what feat or additional magic items you have, when using special ingredients you will make an additional stand alone roll to see if you have successfully integrated the special ingredients. If this fails the food is still good to eat but you gain no extra bonuses and the food is used up.  

You can tell you have a specialty item when the following adjectives are used in the item name:

For buying special ingredients:
Str, = 100 gp

con = 200 gp
Int cha= 300 gp
Dex wis= 400 gp

Be wary of knock offs or expired ingredients. They will have the opposite effects even if they are properly prepared.