Muffins or Cup Cakes?

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Can anybody tell me what the difference is between Cup Cakes and Muffins? Is there a difference or is it just the same thing? In that past year or so supermarkets, here in Holland, have been adding "muffins" to their assortment of baked goods. But what they label as Muffins look just like Cup Cakes to me. And if you have a favorite Muffin recipe please feel free to post it too. I'd love to try yours.