Prepare a roux using melted butter and flour. Pour in the sour cream and water. Then add the chopped pumpkin, salt, black pepper, and cook until soft. Finally, blend the mixture, add more water or broth if needed, and bring to a boil.

Meanwhile, arrange sliced cheese on a baking sheet lined with parchment paper and bake at 180°C for approximately 8-10 minutes. Allow to cool.