In a medium saucepan, combine the chicken stock and porcinis. Simmer until the porcinis are tender, 8 to 10 minutes.
Meanwhile, in a soup pot, heat the EVOO, 2 turns of the pan, over medium-high heat until hot. Crumble in the sausage, then add the onion and garlic and cook until browned, about 5 minutes. Add the kale and season with salt, pepper and nutmeg. Cook until softened, about 5 minutes.
Remove the porcinis from the stock and chop; stir into the soup. Stir in the stock and 2 cups water, cover and bring to a boil. Add the pasta to the soup and cook until al dente, 6 to 7 minutes. Stir in the beans and heat through. Serve in shallow bowls with lots of cheese on top and the bread for mopping.