to ask for help with a stage prop

[Mummynextdoor]

This is totally random but i need to acquire a large realistic looking piece of cheese to be used by DD who is a mouse in a production. I am not particularly crafty - ideally needs to be A5 type size!

Any ideas where I could acquire or what I could use to make such a thing?

Cut up a yellow sponge - the sort you wash a car with?

Oasis foam, the stuff florists use? Spray yellow if it's not already that colour and cut to shape. Or foam from somewhere that upholsters etc.

Large yellow car washing sponge and cut it into a wedge?

A5 isn’t particularly big.

Paint a box yellow or use a car sponge?

A large box can be cut up and taped together to make a 3D triangle type wedge shape..paint yellow

Wait...A5 is tiny. Use a cereal box.

Car sponge is genius!

Oh or an empty sandwich takeaway carton, paint it yellow with black cartoon cheese holes