Preheat to 375 °F (190 °C) and lightly grease a 9×13-inch dish.
Boil noodles in salted water until al dente, then drain. Skip if using no-boil noodles.
Stir ricotta, egg, ranch seasoning, and ½ cup Parmesan until smooth.
Spread about ¼ cup Alfredo sauce on the dish bottom.
Add 3 noodles, ⅓ of ricotta mix, 1 cup chicken, some bacon, mozzarella, and a drizzle of Alfredo.
Repeat layers twice. Finish with noodles, remaining Alfredo, and mozzarella.
Cover with foil and bake 30 minutes.
Uncover and bake 10–15 minutes until golden and bubbly.
Cool for 10 minutes. Top with parsley and remaining bacon. Serve warm.