Sometimes I goto /warp passive. There are regular mooshroom cows but missing brown ones too. Those are usually attainable with lightning strike during thunderstorm or channeling trident. That's kinda tricky on this server... Its barely mentioned with lightning strike. Mooshroom – Minecraft Wiki

 

this is me finding out brown mooshrooms exist

 

Support, considering lightning is turned off.

 

Support, it's been suggested before a few times, giving us more ways to farm mushrooms is always a plus