Dobby likes fruity Zupreem and nutri berries and whatever we're eating he can steal and veggies and things when we have some. Lurch like Zupreem and nutri berries, apples, lettuce, corn on the cob, rice, bread, etc. Nerd ate health food sunflower seeds, millet, peanuts, nutriberries, whatever we were eating but I got him in 78 with his brother and we did what we thought was best before I knew anything about Pionus parrots which were new to anyone back then. He made it 31 happy years so something was working and he was skinny but few issues that whole time, but he was skinny when we got him. We did put some pellets in with his goodies after the vet we took him to for one of his minor issues about 20 years in suggested them and he'd eat them if he felt like crunching something. We were also told seeing how he was underweight to feed him anything safe for him to fatten him up but he consistently was at 214 grams early in the morning, and maybe 227 after munching all day.
Obviously we do mostly pellets now and they seem to do well and like them so it's important that they actually eat them and their weight is consistent for the body size they happen to be.