Roast the pumpkin until soft, about 25 minutes, then puree.
In a bowl, combine pumpkin puree, flour, egg, salt, and pepper.
Form dough into logs and cut into gnocchi-sized pieces.
Boil gnocchi in salted water until they float, about 2-3 minutes.
In a skillet, melt butter and sauté garlic until fragrant.
Add vegetable broth, then stir in cream, salt, and pepper.
Toss the gnocchi in the sauce, garnish with sage, and serve.