Preheat oven to 350°.
Cook pasta according to package directions.
Drain and mix pasta with Alfredo sauce, sour cream, and chicken.
Combine ricotta, garlic, thyme, oregano, sage, eggs, Parmesan, and parsley.
Season with salt and pepper.
Add ricotta mixture to pasta. Stir to combine.
Top with a thick layer of mozzarella.
Bake in a 9″ x 13″ cassarôle dish for 30 minutes.
Broil for 2-3 minutes or until cheese starts to brown.