No — we recommend avoiding mushrooms entirely. Some varieties cause digestive upset and liver failure in birds, and the risk isn't worth the zero benefit.
Mushrooms are fungi, not vegetables, and several species are toxic to birds — caps and stems of certain varieties can cause digestive upset and liver failure. Some keepers feed plain cooked button mushrooms without issue, but mushrooms offer parrots no nutrition that safer vegetables don't, so the risk-reward is all risk.
If the mushroom was a store-bought culinary variety, watch closely for lethargy or droppings changes and call your avian vet. If it was a wild mushroom, treat it as poisoning: Remove all remaining food from the cage, note what and roughly how much was eaten, and call an avian vet or an animal poison control hotline immediately. Do not wait for symptoms — early treatment makes the difference.