Sprouts and a mixed variety are sometimes the best to give to birds since birds like variety.
One mix is 15 bean soup (no spice packet or 5-6 different types of safe beans) cooked, brown rice or wild rice cooked (better than white rice, but that's all I have), and 5+ types of veggies (fresh, frozne, or cooked), and maybe some fruit (like berries) added in right before feeding.
Using that recipe (and making it however you want) was one way many people were able to get their birds to eat more fresh foods... because it's variety. It's not boring. Most birds were eating it within a matter of two days. Some had reports of "I put the food in, and all I've seen for the past half hour is bottoms up!" where-in the birds never quite cared for fresh foods before, they were now digging into this stuff.
However, not all birds will take to cooked mixes. If you find that your bird prefers individual veggies, go for that instead. See if they prefer their foods fresh (except for foods that require cooking or light steaming), see if they prefer it with rice, pastas, beans or in breads, see if they prefer it steamed or cooked. Leave it in chunks, slice it, dice it, mash it... just try to find the best way that each bird prefers their food.