Preheat the oven at 200°C.
Peel the pumpkin and cut it in half. Use a large spoon to scrape out the seeds and stingy pulp. Cut the pumpkin in small pieces and cook it until soft. Then puree the cooked pumpkin using a hand blender.
In a bowl beat the butter and sugar until frothy. Add the eggs one by one, then add the pumpkin and mix well.
Add flour, baking powder, cinnamon, nutmeg, pinch of salt and mix well.
Then add raisins and chopped nuts.
Put the batter in muffin paper cups and bake for approx. 25 minutes in the oven.