Stir together Alfredo sauce and sour cream; toss with ziti until evenly coated.
Spoon half of mixture into a lightly greased 13- x 9-inch baking dish.
Stir together ricotta cheese and next 3 ingredients; spread evenly over pasta mixture in baking dish.
Spoon remaining pasta mixture evenly over ricotta cheese layer; sprinkle evenly with mozzarella cheese.
Bake at 350 for 30 minutes or until bubbly.
Note: For testing purposes only, we used Buitoni Refrigerated Alfredo Sauce.
