Step 1: Cook the Pasta : Bring a large pot of salted water to a boil. Cook fettuccine or linguine according to package instructions until al dente. Reserve ½ cup pasta water and drain the pasta.
Step 2: Prepare the Sauce : In a large skillet, melt butter over medium heat. Add minced garlic and sauté for 1–2 minutes until fragrant. Stir in pumpkin puree, heavy cream, Parmesan cheese, nutmeg, salt, and pepper. Cook for 3–5 minutes, stirring frequently, until sauce is smooth and heated through.
Step 3: Crisp the Sage (Optional) : In a small pan, heat olive oil over medium heat. Add sage leaves and fry for 1–2 minutes until crispy. Remove and drain on paper towels for garnish.
Step 4: Combine Pasta and Sauce : Add cooked pasta to the pumpkin Alfredo sauce. Toss to coat, adding reserved pasta water a little at a time to achieve desired consistency. Adjust seasoning with salt and pepper.
Step 5: Serve : Plate the pasta and garnish with crispy sage, extra Parmesan, and optional toasted pine nuts or breadcrumbs. Serve immediately while hot.