If you need to precook your sheets, then boil the lasagna sheets in a pot of water just until they’re soft enough to bend, or follow the package instructions if using oven-ready sheets. Lay them flat on a tray to prevent sticking.
14-15 lasagna sheets
Preheat your oven to 350°F (180°C) and grease a 9x13-inch baking dish.
In a bowl, season the cooked shredded chicken with garlic powder, paprika, salt, and pepper, mixing well to coat evenly.
4 cups cooked shredded chicken, 1 teaspoon garlic powder, 1 teaspoon paprika powder, Salt and pepper
Melt butter in a large skillet over medium heat, whisking in the flour to create a thick paste. Add the minced garlic and gradually whisk in the milk. Stir continuously until the mixture begins to thicken.
¼ cup unsalted butter, 4 tablespoons all-purpose flour, 2 cups whole milk, 1 tablespoon minced garlic
Reduce heat and mix in the mozzarella cheese, heavy cream, Italian seasoning, spinach, salt, and pepper. Stir until the cheese has melted and the sauce is smooth. Adjust with more milk if needed for a thinner consistency.
2 teaspoons Italian seasoning, 1 cup heavy cream, 2 cups shredded mozzarella cheese, 2 cups chopped spinach, Salt and pepper
In the prepared baking dish, layer a bit of the spinach Alfredo sauce on the bottom. Add a layer of lasagna sheets, spread ricotta cheese (if using), top with seasoned chicken, and then more sauce. Repeat the layers, finishing with a generous layer of spinach Alfredo sauce on top. Sprinkle Parmesan cheese evenly across the top.
1 cup ricotta cheese, 1 cup Parmesan cheese
Bake for 35-40 minutes, or until the top is golden brown and the sauce is bubbling. Let it rest for 10 minutes before slicing and serving, and enjoy!