Preheat oven to 350F degrees. Grease the sides of an 8 or 9" springform pan with coconut oil and line the bottom with parchment paper.
Combine zucchini, applesauce, eggs, banana, maple syrup, vanilla and coconut oil in a large bowl.
Combine flours, baking powder and ground spices in a separate bowl.
Combine dry and wet ingredients together. Fold in chopped walnuts but reserve some to sprinkle on top of cake.
Pour cake mixture into springform pan. Place in oven and bake for 25-35 minutes until a knife inserted comes out clean.