They are natural to the diet of birds and allow them to work for their food. Sweet potatoes are one of the most nutritious foods on earth and parrots of all ages will readily eat it, thereby getting a good supply of Vitamin A and other valuable nutrients as well as fiber. Beans should be cooked well done. Add CORN to your brown rice and bean mix and your birds will not be able to resist this healthy and tasty combination. I soak whole dried corn kernels or popcorn overnight and cook it until it plumps up to triple its size.
Cooked pasta is another good carbohydrates food that parrots relish.
TOFU is another good protein food and it will take on the flavor of anything that you mix it with or soak it in. It is a great food for newly weaned chicks because it supplies quality protein and is easy for young birds to eat. EGGS are the most nearly perfect protein food. Three times a week, my birds get hard boiled egg, shell and all. Protein quality is expressed as biological value which measures the rate of efficiency that protein is used for growth.