What shape is this?

Okay, my housemate, Sam, baked some cupcakes/muffins yesterday.

Then she messaged me on MSN saying that there were SQUARE cupcakes/muffins.

o.O?

So I went down to have a look.

This is what I saw:

I really don't think it's a SQUARE!

So, I want to ask you all, is this a SQUARE? Or a CIRCLE? Or just a BLOB? XD