Cook pasta according to package directions. Set aside, covered.

In a large frying pan, heat olive oil and butter.

Add mushrooms and sauté for four minutes.

Add sage, nutmeg, salt, and pepper and stir together.

Add cooking cream and pumpkin and simmer for five minutes, until well combined. A whisk is helpful here.

Taste and adjust seasoning if necessary. Toss together with warm pasta.

Garnish with Parmesan cheese, and sage leaves if desired.