Chicken Alfredo

I came home from work today and Alex was in the process of making this. It's very, very rich, but oh so good. Would definitely make it again (or get him to, ha ha)! It *is* a bit time consuming, but it's so worth it.

2-3 boneless, skinless chicken breasts, cut into cubes
6 tablespoons butter, divided
4 cloves garlic, minced, divided
1 tablespoon Italian seasoning
1 pound pasta
1 onion, diced
1 8-ounce package sliced mushrooms
1/3 cup all purpose flour
1/4 teaspoon salt
1/4 teaspoon black pepper
4 cups homogenized milk
3/4 cup fresh grated parmesan cheese
8 ounces shredded mozzarella cheese
1/2 cup sour cream

In a large skillet over medium heat, combine chicken, 2 tablespoons butter, 2 cloves garlic and Italian seasoning. Cook until chicken is no longer pink inside. Remove from skillet and set aside.

Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8-10 minutes, or until al dente; drain.

Meanwhile, melt 4 tablespoons butter int he skillet. Saute onion, 2 cloves garlic and mushrooms until onions are transparent. Stir in flour, salt and pepper; cook 2 minutes. Slowly add in milk, stirring until smooth and creamy, then stir in sour cream and cheeses until cheese is melted. Finally, stir in the chicken mixture and heat while stirring for about 5 minutes. Serve over the cooked pasta.