Muffcakes?

At my most recent BBQ my friends and I found ourselves confronted with a singularly intractable problem. What exactly defines a muffin as distinct from a cupcake, and vice versa? Many theories were floated, but while all potentially equally valid (or invalid, as the case may be), all lacked a convincing air of correctness. Whether or not fruit or icing is present? If a wrapper is used? None were conclusive and exceptions abound.

So I put it to you, dear readers: How do you tell the difference between a muffin and a cupcake?

Also, in case you were wondering, these (concocted and brought by a generous friend) were what sparked the controversy in the first place because they're so incredibly delicious and we had the classic human urge to classify them according to their appropriate species. But perhaps they are the culinary equivalent of the platypus? We decided to compromise on the name (which we also thought Cupcake Royale might like).

BANANA CHOCOLATE-CHIP MUFFCAKES
Adapted from Aunt Jemima's Pancake Muffins - even they're not sure what to call them! (Our additions in italics.)

2 C Aunt Jemima® Whole Wheat Blend Pancake & Waffle Mix
½ t Cinnamon, ground
⅔ C 2% Milk
⅓ C Honey
1 Egg, slightly beaten
¼ C Vegetable Oil
1 t Vanilla Extract
2 Bananas, mashed
½ Bag Chocolate Chips (or as many as you think you can get away with!)

1. Preheat oven to 425° F.
2. Spray 12 medium muffin cups with nonfat cooking spray or line with paper baking cups. Our recipe made 15, not 12...
3. Combine pancake mix and cinnamon in medium bowl.
4. Combine milk, honey, egg, oil and vanilla and banana in small bowl with wire whisk; add to dry mixture. Mix just until dry ingredients are moistened. Mix in chocolate chips last.
5. Fill muffin cups ¾ full. Bake 15-18 minutes or until toothpick inserted in center comes out clean.
6. Cool 2 minutes in pan. Remove to cooling rack.

Notes:
1. You could use pretty much any fruit - the bananas add moisture, other fruits would be more like the chocolate chips and remain chunks instead of blending in so well.
2. Top with icing and a drizzle of chocolate sauce, or really anything for that matter. I can imagine topping these with raspberry-ginger preserves, etc.