Cook the pasta al dente in plenty of salted water.
In the meantime, wash the spinach leaves and shake dry. Cut the onions and garlic into small cubes and fry in the olive oil. Add the spinach and let it collapse over medium heat. Add the cream and sour cream and simmer gently. Season to taste with curry and chili powder (or curry paste) and the instant broth.
Mix the sauce with the pasta, serve immediately and serve with freshly grated Parmesan.