Preheat oven to 350 degrees. Blend all ingredients together until smooth, about 3-4 minutes. Fill baking cups 3/4 full and bake in a preheated oven about 20 minutes until done. Check for doneness with a toothpick inserted into the top of the muffin, if the toothpick comes out clean the muffin is done.
Store muffins if there are any left in an airtight container. I use the extra large cups and this will make about 9. These banana nut muffins stay fresh for longer than your homemade banana nut muffins. By using a cake mix these are consistently moister and it really helps to layer the banana flavor.