In a mixing bowl, combine the shredded chicken, ricotta cheese, chopped spinach, minced garlic, Italian seasoning, salt, and pepper. Mix well until all ingredients are evenly incorporated.
Spread a thin layer of Alfredo sauce on the bottom of a 9x13 inch baking dish.
Place 4 lasagna noodles over the sauce, slightly overlapping them.
Spread half of the chicken and ricotta mixture over the noodles. Top with 1 cup of mozzarella cheese and a third of the remaining Alfredo sauce.
Repeat the layering process: add another layer of 4 lasagna noodles, the remaining chicken and ricotta mixture, another cup of mozzarella cheese, and half of the remaining Alfredo sauce.
Top the last layer with the final 4 lasagna noodles. Spread the remaining Alfredo sauce on top and sprinkle with the remaining mozzarella cheese and all of the Parmesan cheese.
Cover the baking dish with aluminum foil and bake for 25 minutes.
After 25 minutes, remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and golden brown.
Once done, remove from the oven and let it cool for about 10 minutes before slicing. Garnish with fresh parsley before serving.
Notes
Let the lasagna cool for 10 minutes before slicing for easier serving.