1. Fill a large pot with water, add a pinch of salt, and bring it to a boil. Cook the spaghetti according to the package instructions until al dente. Drain and set aside.
2. While the spaghetti is cooking, prepare the courgettes. Trim the ends, then use a spiralizer or a julienne peeler to create thin spaghetti-like strips. Set aside.
3. In a large frying pan or skillet, heat the olive oil over medium heat. Add the finely chopped onion and minced garlic. Sauté until the onion turns translucent and the garlic becomes fragrant.
4. Dissolve the saffron threads in a tablespoon of warm water, then add it to the frying pan along with the courgette strips. Sauté for about 5 minutes until the courgettes are slightly tender.
5. Reduce the heat to low, then add the cream cheese to the pan. Stir gently until the cheese melts and coats the courgettes evenly. Season with salt and pepper according to your taste. Allow the sauce to simmer for a few minutes until it thickens slightly.
6. Add the cooked spaghetti to the pan, tossing gently to combine the sauce with the pasta. Cook for an additional 2-3 minutes until the spaghetti is heated through.
7. Remove from heat and transfer the saffron and courgette spaghetti to serving plates. Garnish with fresh parsley for an extra touch of freshness.
8. Serve immediately and enjoy your flavorful saffron and courgette spaghetti with onion cream cheese!

Note: This recipe serves approximately 2-3 people. Feel free to adjust the quantities based on your desired servings.