Preheat oven to 350FPrepare 1 or two Jumbo muffin pans with 12 muffin papers.
In a large bowl combine the flour, sugar, baking powder, baking soda, salt, cinnamon, and nutmeg.
Mix in the melted butter, egg, buttermilk and vanilla until combined. If the batter very thick and not easily mixed, add the milk (some buttermilk is quite thick which results in a that's batter too firm. The milk will loosen the batter).
Fold in the raisins.
Add the batter evenly into the 12 muffin papers.
Bake 25-30 minutes or until golden and a cake tester comes out clean
Remove from oven and let rest in pan for 5 minutes.
Meanwhile, combine sugar and cinnamon topping. Dip the muffin tops in the melted butter then coat in the cinnamon sugar. Place on a cooling rack and repeat with remaining muffins. Best served warm