Moist and super yummy Raisin Muffins. I made them from a basic muffin recipe then adding some ingredients of my own and tweaking the cooking time. Very easy to make! Chop the raisins finely--don't mash them! The banana makes the already moist muffins, well, more moist with just a hint of banana flavor. Not to mention that it gives a good look on the muffin top crust. It's important that you use an overripe banana. Enjoy!