Bring a large pot of salted water to a rolling boil and cook penne according to package directions until al dente, approximately 10-12 minutes. Reserve 1 cup of pasta water before draining—this starchy liquid creates silky sauce consistency that cream alone cannot achieve.

While pasta cooks, melt butter over medium heat in a large skillet and add minced garlic, cooking for 60 seconds until fragrant. This aromatic foundation prevents raw garlic flavor from overpowering your creamy pumpkin alfredo sauce components.

Whisk pumpkin puree, heavy cream, and whole milk together in a separate bowl until completely smooth and lump-free. Pour this mixture into the garlic-butter skillet and stir constantly for 3-4 minutes until steaming but not boiling, which prevents curdling.

Add grated Parmesan cheese gradually while whisking continuously, incorporating nutmeg, cayenne, salt, and fresh sage. The key timing here is quick, constant whisking for 2 minutes—this allows cheese to melt evenly without becoming grainy, creating the silky texture that defines this fall pasta masterpiece.

Combine the drained penne with the sauce, adding reserved pasta water 1/4 cup at a time until reaching desired consistency. The starch creates creamy coating without additional cream, so resist the urge to add everything immediately—build texture gradually.

Toss gently until every strand is coated, then divide among four bowls and top with toasted pine nuts, crumbled turkey strips, and additional sage leaves for visual appeal and flavor bursts.