Preheat oven to 375 degrees F. Spray a 9x13-inch baking dish with nonstick cooking spray; set aside.
In a large mixing bowl, combine diced chicken, buffalo sauce, ranch dressing and tomatoes; set aside.
In another bowl, combine parsley, salt, pepper, ricotta, eggs and bleu cheese; set aside. Spread 1⁄3 of the chicken mixture in the bottom of the pan, top with 4 lasagna noodles, 1⁄3 ricotta mixture and 2⁄3 cup mozzarella cheese. Repeat layers two more times.
Cover the pan with foil and bake for 30 minutes. Remove foil and bake an additional 20 minutes or until cheese is melted.