1. Put the sweet potatoes and pumpkins in the oven at 200 degrees and bake for 50 minutes.
2. Remove the sweet potatoes and pumpkins, peel them, and cut into small pieces.
3. Put butter in the pan, add bay leaves, and fry with onions.
4. Pour in pumpkin and sweet potato, and stir fry together.
5. Add water and boil for 10 minutes.
6. Put the ingredients in a blender and break them.
7. Pour into the soup pot, add cream, salt, sugar, and season.