Well, muffins in France, you said. Mass produced and packaged muffins are already available in some French supermarket, but this product has never been seriously promoted in here. Say, it’s a piece of packaged bakery like any other, and not much emphasis has been put on the American identity of this product.
Some bakery departments is some supermarkets and some small sized bakery do some fresh muffins on what seems to be a random basis. Actually, most French don’t know what you are talking about if you ask them what a muffin is. They would buy some accidentally on a shopping day without paying much attention to the name.

However, one may notice that some serious attempts to introduce American style donuts on the French market are underway since about one year. I don’t know which company does it and why didn’t they associate muffins to those attempts. However, I notice that no special emphasis has been put on the American origins of this product, but a relatively large place is accorded to donuts in the bakery department of many French supermarkets. 4 types of donuts only are available at this time. Their retail price is relatively high when compared to French typical and similar types of bakery, which are croissants (same as in U.S.); “pains-au-chocolat;” “chouquettes;” and “chaussons-aux-pommes” (Google these names for pictures).
Actually, donuts are the most expensive among all similar French style products, and this constitutes certainly a handicap as the French economy and the average salary know a steep downfall (I can provide you with accurate retail prices, eventually.) I happen to buy those donuts whose taste is exactly similar to the average in U.S., but not muffins which don’t look much attractive. That’s why I know close to nothing about those muffins at this point.

Well, see you soon by mail, maybe.