In a large pot of generously salted boiling water, add the fettuccine and cook according to the package instructions, aiming for al dente. Once cooked, drain the pasta, but reserve about ½ cup of the pasta water. Set the drained pasta aside.
In a spacious skillet, warm the olive oil over medium heat. Add the minced garlic and sauté for approximately 1-2 minutes until aromatic, being careful not to brown it.
Stir in the pumpkin puree, cooking for an additional minute to warm through. Gradually add the heavy cream, whisking gently to combine into a smooth mixture.
Sprinkle the grated Parmesan cheese, ground nutmeg, and ground cinnamon into the skillet. Stir continuously until the cheese melts completely. If the sauce is too thick, mix in a little reserved pasta water to achieve your preferred consistency.
Transfer the cooked fettuccine into the skillet, tossing gently to coat in the creamy pumpkin sauce. Taste and season with sea salt and freshly cracked black pepper.
Remove the skillet from heat and sprinkle finely chopped fresh parsley over the top. Serve immediately while hot.
Notes
For an appealing presentation, serve the pasta in large, shallow bowls with a drizzle of olive oil and extra Parmesan.