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Prepare the Oven
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Preheat oven to 375°F (190°C).
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Lightly grease a 9×13-inch baking dish.
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Make the Cream Sauce
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Melt butter in a saucepan over medium heat.
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Whisk in flour and cook for about 1 minute until lightly golden.
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Gradually pour in warm milk while whisking constantly.
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Simmer until thickened (about 3–5 minutes).
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Stir in salt, pepper, Dijon mustard, mozzarella, and Parmesan.
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Cook until smooth and creamy. Remove from heat.
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Season the Chicken
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In a bowl, mix shredded chicken with garlic powder, salt, and pepper.
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Assemble the Lasagna
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Layer in this order:
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Thin layer of cream sauce
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3 lasagna noodles
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Half of the chicken
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Half of the ham slices
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1 cup Swiss cheese
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Sauce
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Repeat layers once more.
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Finish with:
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Final layer of noodles
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Remaining sauce
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1 cup mozzarella on top
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Bake
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Cover with foil and bake for 25 minutes.
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Remove foil and bake an additional 15 minutes until golden and bubbling.
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Rest Before Serving
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Let sit for 10 minutes before slicing.
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This helps the layers hold together.