Cheesy Chicken Tetrazzini

Preheat oven to 325 degrees F (165 degrees C). Heat butter in a large skillet over medium heat. Stir in chicken pieces, and cook to brown. Stir in mushrooms, and brown. Add red pepper and green onion, and cook several minutes, stirring constantly. Stir in flour, and cook several minutes, stirring until well blended. Gradually stir in chicken broth, cream, and sherry; cook, stirring, until smooth and thickened. Season with salt, pepper, and thyme. Meanwhile, bring a large pot of lightly salted water to a boil. Add pasta, and cook until just tender, about 8 minutes; drain. Toss chicken mixture with pasta, Parmesan cheese, and parsley. Spoon into a 1 1/2-quart baking dish. Bake in a preheated oven for 35 minutes. Remove, top with Jarlsberg cheese, and return to oven; bake until cheese is melted.