2Meanwhile, mix milk, pumpkin, Parmesan cheese, flour, pumpkin pie spice, chipotle chili pepper and salt in medium bowl until well blended. Set aside. Cook bacon in large skillet on medium-high heat until slightly crisp. Remove bacon. Drain on paper towels. Set aside.
3Remove all but 2 tablespoons bacon drippings from skillet. Add onion; cook and stir 3 minutes or softened. Stir in pumpkin mixture. Reduce heat to low; simmer 10 minutes or until thickened, stirring occasionally.
4Place pasta in serving bowl. Add pumpkin sauce; toss to coat well. Top with crisp bacon.