Brian and I love our banana nut muffins! While I watch the fat and calories, he's more into watching the salt and sugar. They really don't take very long when making them from scratch but when you are a busy person, you want to make them even faster! Especially when you want to throw in a batch so you can have one before leaving the house for work at 6:45 a.m.
I've thrown the dry ingredients together many times the night before so it would be quicker in the morning. I recently got this idea to make up several Ziplock bags of the dry ingredients, mark them, and store them in an air-tight container. This has worked so well! I always have ripened bananas in the freezer. I just put them in the microwave for a couple minutes on a very low (about 20%) power. Simply add the moist ingredients, and they can be thrown together in about 5 minutes, and cleanup is next to nothing.
This will also works well with cookie recipes, brownie recipes, and quick bread recipes. Between making up the bags and cleaning the mess, it took less than 45 minutes to make up four bags of his, and four bags of mine.
I recently posted my low-fat banana chocolate chip muffin recipe here at my blog. The link is here if you missed it.