Preheat the oven to 180°C. Line a muffin tray with 10 muffin liners.In a large bowl, combine the flours, sugar, cinnamon, baking powder, baking soda and salt. In a separate bowl, combine the carrot, apple, eggs, milk, oil and vanilla essence.Combine the two bowls together and gently fold together. Fold in the walnuts. Spoon batter into the muffin cups and bake for 15-20 minutes or until a skewer comes out clean. Serve warm with butter or coconut oil.Once cold, suitable to freeze.