Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish.
In a large bowl, combine cooked chicken, crumbled bacon, cream cheese, sour cream, ranch seasoning, cheddar, and mozzarella. Mix until smooth and creamy.
Spread ½ cup marinara sauce on the bottom of the baking dish. Layer 3 lasagna noodles over the sauce. Spread ⅓ of the crack chicken mixture evenly over the noodles. Top with ½ cup marinara sauce and ½ cup shredded mozzarella. Repeat layers twice more: noodles, chicken mixture, marinara, and mozzarella. Finish with a final layer of noodles, remaining marinara, and a generous sprinkle of mozzarella and Parmesan.
Cover with foil and bake for 25 minutes. Remove foil and bake for an additional 10–15 minutes, until bubbly and golden on top.
Let rest for 5–10 minutes before slicing. Garnish with extra bacon bits or chopped parsley if desired.
