Fill a large pot with water, add a pinch of salt, and bring it to a boil. Add the 8 ounces of fettuccine pasta and cook until al dente, about 10 to 12 minutes. Reserve 1/2 cup of pasta water, then drain the pasta and set aside.
In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the minced garlic and sauté for about 1 minute, stirring constantly to prevent burning, until fragrant but not browned.
Reduce heat to low and stir in 1 cup of pumpkin puree. Mix well with the garlic and oil. Slowly pour in 1 cup of heavy cream, stirring continuously to combine. Add 1 teaspoon Italian seasoning and salt and pepper to taste. Let the sauce simmer gently for 3 to 5 minutes, stirring occasionally.
Remove the skillet from heat and stir in 1/2 cup grated Parmesan cheese until melted smoothly into the sauce. If the sauce is too thick, add a splash of reserved pasta water to loosen it.
Add the drained fettuccine to the skillet with the sauce. Toss gently but thoroughly to coat the pasta evenly. Add more pasta water if needed to achieve the desired sauce consistency.
Transfer the pasta to serving plates or a large bowl. Garnish with freshly chopped parsley. Serve immediately and enjoy.