I recall watching this clip from a movie on YouTube in the early 2010s. It starts with a plane flying with pepper pouring out causing the mouse king and his assistant to cough. It then plays a song as the mice eat a lot of food while they get fatter and fatter. After the song was over, the mouse king was walking through the other mice who are now round balls. It then shows one mouse spitting out another mouse and getting thin again. Weird isn't it?
I had to recreate the scene from memory by making drawings basedoff of it and even made someanimations. I actually tried to search for it on YouTube with no luck so it's very likely the video got taken down due to copyright.
The first movie that came to my mind was The Tale of Despereaux, since it came out around that time and had mice/a plot about cooking. Though, I don't recall any scene like that. (Granted, it's been nearly a decade since I've watched the film.)
Do you remember anything else that stood out, like the artstyle, the way the characters spoke, etc.? Do you think the movie could have been from another country?