Preheat oven to 375°F (190°C).
Cook lasagna noodles according to package instructions.
In a bowl, mix ricotta cheese, spinach, salt, and pepper.
Spread a thin layer of Alfredo sauce on the bottom of a baking dish.
Place 3 lasagna noodles on top.
Spread half of the ricotta mixture over the noodles.
Add half of the shredded chicken.
Pour ⅓ of the Alfredo sauce over the chicken.
Sprinkle ⅓ of the mozzarella cheese.
Repeat layers, ending with noodles, Alfredo sauce, and mozzarella cheese.
Sprinkle Parmesan cheese on top.
Cover with foil and bake for 30 minutes.
Remove foil and bake for another 10 minutes or until cheese is bubbly and golden.
Let it rest for 10 minutes before serving.