Further to what the pther replies have proposed:
Fresh veg that budgees can eat – carrot, corn, capsicum, cucumber, brocoli or cooked (not hot) sweet potato.
Fresh fruit is great but does need seeds and pits removed.
Boiled eggs (mashed)
Cooked (not hot) brown rice and quinoa

Hope that helps!

Budgie seed mix. Millet. Fresh fruit. Dried fruit. Cuttlefish to keep their beak trim

Millet! You can buy them on small branch type things. My budgie loves it