Step 1

Preheat oven to 350ºF. Grease a large casserole.

Step 2

Cook pasta al dente in boiling salted water.

Step 3

In a deep skillet, melt butter over medium heat. Add onions and garlic and cook until soft, about 5 minutes. Add flour and stir to form a paste. Cook for 2 to 3 minutes. Slowly whisk in milk until smooth. Whisk in 1 cup of cheese. When cheese is melted, add pumpkin and sage. Season with salt and pepper.

Step 4

Mix pumpkin mixture with pasta and spread in prepared dish. Mix together remaining cheese and bread crumbs and sprinkle on top.

Step 5

Bake for 30 minutes, or until topping has browned.