Preheat the oven to 375 degrees F. Line a muffin pan with paper liners or grease the pan with oil or butter. Pulse the walnuts in a food processor to break down into a coarse flour. Transfer to a large mixing bowl and combine the remaining dry ingredients. Then, mix in the wet ingredients, using a spatula to gently fold the mixture together. Divide the batter evenly into the muffin pan. Place a slice of banana or blood orange on top of each muffin with a sprinkling of cinnamon. Bake for about 18-2o minutes, or until the center is lightly cooked but still soft. Serve hot with raw honey and spread of almond butter or raw tahini!