Any spice that has medicinal qualities in humans can be dangerous--not saying cloves are for sure, but they are a serious spice-- used to use them instead of dental numbing. I'd say garlic and onions are more dangerous than a hint of cassia, but it depends on how much is used and in what. Cloves will numb your tongue and mouth if you chew them-- allspice has cinnamon and cloves in it.....
There are a lot of unknowns with herbs and spices. ...
Well actually Allspice only Tastes like cinnamon & cloves, it's really its own spice...
"Allspice, also known as Jamaica pepper, myrtle pepper, pimenta, or pimento, is the dried unripe berry of Pimenta dioica, a midcanopy tree native to the Greater Antilles, southern Mexico, and Central America.."(wikipedia)
.. but it seems I can only go so far in limiting what I eat for fear she will get some. I mean, I was using "kitchen pepper" as a replacement for standard onion-garlic heavy steak seasoning on my meats & veggies. Although as I adjusted to my own taste, it's mainly ginger, with some allspice and then cayenne.
I don't keep avocado in the house and I rarely cook with onions. I try to follow keto, or at least low-carb, as much as possible for my own health. I had to stop using avocado oil, the healthiest option, because I kept forgetting and would let her eat from my veggies if she wanted. I deleted nutmeg, which really makes a lot of foods taste better, for the same reason.
But it seems really difficult to remove all the main spices from cooking as well. Do you really think that's necessary? I mean peppers are okay, cayenne is the only one I really like, I try to avoid too much bell pepper due to nightshade issues my own self. Every seasoning and even every food can be considered to have health effects for humans. So that seems a bit to broad a category to limit of foods my birdie might nab.
When I originally looked up foods that were supposed to be UN safe for birds, Nutmeg I thought was the only spice on that list.