What IS a poppyseed muffin?

The only reason I've heard of a poppyseed muffin is because I hacked into the level and found that as an item listed, under the Bonus list.

But what is it? 🙂 I happen to hate poppyseed muffins, which piques the curiosity in me.

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"Gentlemen, you can't fight in here - this is the War Room!"
-Dr. Strangelove
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Will Oram