Muffin or Cupcake?

What, in your opinion, is the difference between a muffin and a cupcake? Is it simply a matter of frosting, or does the divide go deeper? My spouse made dark chocolate "muffin-cupcakes" with a prune lekvar filling. They fell squarely in the Dessert and nowhere near the Breakfast category. But they had no frosting. Opinions? Liminal recipes that illustrate the difference?

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