Minecraft’s mushroom biome sounds like a pleasant place: Food in abundant supply, and zero hostile mob spawns.
However, in all my time playing, I’ve never ever found one. Is there a trick to finding them, or do you just have to get lucky?
It’s important to realize that mushroom biomes only spawn as islands in the middle of oceans.
So, if you want to look for one in a world that doesn’t spawn you in one, you can’t go walking to find one, you need to find an ocean, make a boat, and search the ocean for a mushroom island.
I can’t offer any personal experience of how easy it is to find one by that approach (I’ve no idea whether most oceans contain one, more than one, or just have a chance of containing one).