"Ergh... this muffin taste weird... Huh?? Why am I bloating...?? Wait a minute... THIS IS A MUSHROOM!!"
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So, looks like Bowser ate a few muffins... and a little something else... ;)

Anyway, in my weird imagination (or my Bowser HC, I guess), I see Bowser as someone who's... allergic to mushrooms.. reason why he got bloated for eating some of that one mushroom, that looks like a horrible looking muffin... xD

Anyway, hope you like this sketch. =)