Can a hamster eat pizza

Yes,

I've had two hamsters now

Splinter (female) loved them and went crazy for mushrooms

Dusty (male) also liked mushrooms but not as much as splinter

All rodents can have mushrooms because thare is nothing in them that they cant have.

Just becarful of sugar some rodents get diabeties easily.

Dusty got diabeties but mushrooms were still fine.