Bread-Bakers v105.n038.2

In the Oxford English Dictionary this is how they are explained:
"A light, flat, circular, spongy cake, eaten toasted and buttered at 
breakfast or tea. Formerly (now [dialect]) applied to other kinds of tea-cake."

This site gives an explanation of the whole "Muffin Mystery":

http://imaginatorium.org/words/muffin.htm

I hope this helps.

RisaG, NJ