Line a loaf tin with parchment paper.
Mix together flour, baking powder, baking soda, salt and cinnamon and set aside.
In a bowl whisk eggs, oil and sugar.
With a spatula, fold in the melted butter and buttermilk.
Continuing folding and add half of the flour mixture and then half of the pumpkin, then repeat.
Fold in the raisins and then carefully tip mixture into parchment paper lined loaf tin.
Level the mixture then sprinkle 1 tbsp of turbinado sugar and then 1 tbsp of pumpkin seeds and repeat.
Place in a preheated oven at 350 until you are able to push a skewer into the cake and remove it without dragging out any cake mixture - approx. 45 mins.
Transfer to a wire rack and allow to cool completely before cutting and serving.