How to cook
Preheat the oven to 392°F (200 °C) and grease about 12 muffin cups. You can also use baking paper. Put the pumpkin puree, eggs, buttermilk and oil together in a bowl. In a large bowl, combine the flour, bran, sugar, baking powder, baking soda, cinnamon and salt.
Add the milk and egg mixture to the flour mix and stir gently until everything becomes homogenized. Add the raisins and stir gently once again, but do not overdo it, otherwise it will be more difficult for the muffins to bake.
Put the pumpkin muffins to bake for 15-20 minutes or until they become hard to the touch and a toothpick comes out dry when pierced. Allow them to cool slightly and remove them from the cups.