1Bring a large pot of lightly salted water to a boil. Add pasta, and cook for 8 to 10 minutes, or until al dente; drain.
2While pasta is cooking:
In a saucepan on low heat, melt butter. When butter is melted, add sour cream and cream cheese. When the cream cheese is softened, add heavy cream. Simmer this for 10 minutes on VERY low heat. Add broccoli after about 5 minutes. Stir in Parmesan cheese, Mozzarella cheese, nutmeg, and garlic powder. Heat on low for 2 or 3 minutes. You can season with a tiny bit of salt and pepper. Mix in chicken.