Preheat oven to 350. Grease 9x13" pan

Boil pasta according to package directions. Drain and set aside.

In a skillet, melt butter, add flour, and whisk over medium heat for a few minutes.

Gradually add milk to butter and flour.

Whisk about 5 minutes over medium heat until it starts to thicken

Remove pan from heat and stir in cheese, pumpkin puree, and salt.

Add pasta and stir

Transfer to greased pan and sprinkle parmesan on top

Cover with foil and bake 20 minutes. Remove foil and bake 10 more minutes.