Step 1: Cook the Pasta : Bring a large pot of salted water to a boil. Cook spaghetti according to package instructions until al dente. Reserve 1/2 cup pasta water and drain the rest. Set pasta aside.

Step 2: Make the Pumpkin Alfredo Sauce : Heat olive oil or butter in a large skillet over medium heat. Add minced garlic and sauté for 1–2 minutes until fragrant. Stir in pumpkin puree and heavy cream, mixing until smooth. Add Parmesan cheese, nutmeg, salt, black pepper, and optional red pepper flakes. Simmer gently for 3–5 minutes, stirring occasionally, until sauce thickens slightly. If the sauce is too thick, add a little reserved pasta water until desired consistency is reached.

Step 3: Combine Pasta and Sauce : Add cooked spaghetti to the skillet with pumpkin Alfredo sauce. Toss gently to coat each strand of pasta evenly with the sauce. Cook together for 1–2 minutes to allow pasta to absorb some flavor.

Step 4: Serve: Plate the pasta on individual dishes. Garnish with chopped parsley, extra Parmesan, or a sprinkle of black pepper. Serve immediately while warm.