For the sauce: In a small skillet, melt the butter and cook while stirring, until you see golden-brown flecks. Add the sage leaves and set aside. For the gnocchi, combine pumpkin puree, ricotta, flour, egg, and salt in a medium bowl. Mix into a uniform dough.
On a floured worksurface and with floured hands, roll the dough into a long rope. Cut into small pieces, about 1" long. Optional: gently press a pattern into the gnocchi with the tines of a fork or gnocchi boards.
Bring a large pot of water to a boil. Add some salt and the gnocchi.
Cook the gnocchi until they are floating to the surface.
With a slotted spoon, remove the gnocchi and transfer them to individual plates. Drizzle with sage butter sauce, some fresh ground pepper, and a generous helping of freshly grated parmesan.