Melt butter in saucepan over medium-low heat.
Add cornstarch, salt, pepper and nutmeg. Whisk until smooth.
Add half the coffee cream/whipping cream, whisking until thickened.
Add remaining coffee cream/whipping cream and chicken broth. Increase heat to medium and whisk occasionally until thickened, about 5 minutes.
Add white sauce to turkey mixture and stir.
Combine cooked pasta with turkey/white sauce mixture.
Preheat oven to 400°F. Grease a baking dish with oil and set aside.
Fill baking dishes with pasta mixture.