1. Preheat the oven. Beat the eggs, oil, sugar and buttermilk together on high speed until smooth and well combined. Add the bran and raisins. Sift the dry ingredients over the bowl and stir quickly until just combined.
2. Spoon some of the batter into the cavities of a greased muffin pan and bake for 20 minutes or until cooked and risen. Allow to cool on a wire rack and store in an airtight container.Air fryer tip Pour the batter into four or six silicone cupcake cases, depending on the size of your air fryer.