Looks like you successfully developed a convection system. By isolating the bottom of the muffin from the bottom of the pot effectively, the heat transfer is uniform.

Congrats on learning yet another useful skill. You did good. bacpacboy must've enjoyed the muffin.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)