I used to sell Pampered Chef and somewhere along the line, I came across a version of this recipe. It wasn't very moist and there wasn't enough topping so I doctored it up a little and now my mother has me make it for all of our family get togethers. I hope you enjoy it as much as my family does. It's not too sweet and the cinnamon almost gives a spice cake taste but the Banana nuttiness is wonderful!
Preheat oven to 350 degrees Fahrenheit. Spray bundt cake pan with cooking spray. You could probably use a regular cake pan if you wanted but I've never tried.
In a small bowl, combine 1 cup of the chopped walnuts, the brown sugar, and the melted butter together and stir well. Pour walnut mixture into the bottom of the pan and spread evenly.
In a larger bowl, combine cake mix, remaining walnuts, and cinnamon. Add eggs, mashed bananas, water, and oil. Mix 2 minutes or until well blended and pour into pan on top of nut mixture.
Bake for about an hour. Depending on the size of the bananas, cooking time varies a little. Remove from the pan when a cake tester (or butter knife) comes out clean. Immediately flip pan onto a cooling rack or cookie sheet and scoop out what of the nut mixture didn't come out. Nut mixture is extremely hot so be careful and put it on top of cake. Let cool, slice, and enjoy!