Bring a large pot of salted water to a boil. Add the lasagna noodles and cook according to package directions until al dente. Drain and set aside on a lightly oiled sheet to avoid sticking.
In a medium bowl, combine the ricotta cheese, half of the shredded mozzarella (1 ½ cups), grated Parmesan, garlic powder, Italian seasoning, salt, and pepper. Stir thoroughly to blend all the flavors.
Preheat the oven to 375°F (190°C). Spread a thin layer of Alfredo sauce on the bottom of a 9x13 inch casserole dish. Lay down 4 lasagna noodles side by side. Spread half of the ricotta mixture over the noodles, then sprinkle with 1 cup of shredded chicken. Drizzle with about 1 cup of Alfredo sauce and sprinkle with 1 cup mozzarella.
Repeat the layers: noodles, ricotta mixture, chicken, Alfredo sauce, mozzarella. Finish with a final layer of noodles, the remaining Alfredo sauce, and the last 1 cup mozzarella cheese on top.
Cover the casserole dish tightly with aluminum foil. Bake for 25 minutes. Remove the foil and bake for another 15 minutes, or until the cheese is bubbly and golden brown.
Let the casserole cool for 10 minutes before serving. Garnish with freshly chopped parsley for a touch of color and freshness.