This one is from our great friend Esther at http://paleoonmain.blogspot.com/!!!
Grease 8X8 Cake pan with coconut oil.
Tip: I put a chunk of coconut oil in the bottom of the pan and put it in the preheating oven for a minute or two. This will liquefy it enough to just coat the pan well, plus it makes a nice crispy fried edge to the cake.
Mix together all cake ingredients, folding in the walnuts last.
Pour into cake pan.
Mash 1 additional banana with cinnamon.
Dollop swirl mixture onto top of cake and cut in with a knife.
Bake at 350 for 40 or until a toothpick comes out cleanly
Enjoy plain or slathered with additional coconut oil.