Preheat the oven to 190ºC. 

For larger muffins, grease or line a 6 x 3/4 cup muffin tin. For smaller muffins, use a 12 x 1/3 cup muffin tin and grease or line just 9 of them.

In a large bowl add the melted butter and honey and whisk to combine. 

Then add both of the eggs and whisk again. 

Now pour in the buttermilk and whisk again.

Add to the bowl the grated carrot, flour, cinnamon, baking powder and brown sugar and finally the sultanas. Using a spatula mix the wet and dry ingredients together until just combined. Don’t worry if there are a few lumps. Don't overmix. Use a very light touch.

Pour the muffin batter into the prepared muffin tray.

Sprinkle each muffin with a small amount of rolled oats.

Bake for 20-30 minutes or until the muffins have risen and are firm to touch.