Fruity Rainbow Flakes

Fruity Rainbow Flakes are a cereal Phineas & Ferb eat for breakfast. They are seen eating it when Isabella walks in their house and says Whatcha Eatin'? "Hail Doofania!"

*Phineas and Ferb eating Fruity Rainbow Flakes*

Isabella: Whatcha Eatin'?

Phineas: Fruity Rainbow Flakes, you want some?

Isabella: Oh no thanks, I already had breakfast.