[–] MetalAegis ago (edited ago)
Line the walls with this memory foam material it works similar to the sound proofing material they use in recording studios by dissipating the sound waves.
Alternately you can order online and get a bunch of egg carton flats and attach them to the walls and ceiling.
[–] watch_listed 0 points 2 points 2 points (+2|-0) ago
I'd be wary of sticking up flammable materials up on the wall of a kitchen.
[–] MetalAegis ago
You can order fireproof acoustic cancelling foam but it's a very expensive.
[–] Lemongarb ago
A few of these spread about the walls will help.