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Preheat Oven: Preheat to 375°F (190°C).
Layer Lasagna: Spread a thin layer of Alfredo sauce in the bottom of a baking dish. Layer with noodles, chicken, ham, Swiss cheese, and spinach if using. Repeat layers, ending with cheese on top.
Season: Sprinkle with thyme, salt, and pepper.
Bake: Cover with foil and bake for 30 minutes. Remove foil and bake for an additional 10 minutes until bubbly and golden.
Let cool slightly before serving. Enjoy this creamy, savory twist on a classic!