I ran across a list of "supplements" for parrots in my "Parrots for Dummies" book that have added health benefits. Some would work as spices, I've pulled them out and listed them here:
Cayenne: Helps with digestion and arthritis, plus parrots like spicy foods. Sprinkle on food or cook with it.
Cinnamon: Helps with digestion and blood sugar. Sprinkle on soft foods or cook with it.
Garlic: Natural antibiotic, among other things. Use extract from a health store, or offer your parrot a mix of carrot juice and garlic cloves.
Nutritional Yeast: Contains lots of B vitamins, and apparently it tastes a bit like butter? Sprinkle on soft food.
The suggestion is to mix things up a bit, though. For example, if you put cinnamon on her food for a week then don't put cinnamon on her food at all the next week.
This is just a bit from the book I'm reading, I've only had my Sunshine for four days now and I still can't get her to eat anything except those artificially dyed pellets they fed her at PetCo - we're working on that. But maybe this will help.
