In a large saucepan, combine milk, chicken broth, and chicken stock powder. Bring to a gentle simmer, then add chicken, bay leaves, thyme, and black pepper. Cover and simmer for about 15 minutes. Remove chicken and shred it, keeping the poaching liquid.
In a skillet, melt half of the butter and olive oil. Add half the mushrooms and garlic, sauté until golden. Repeat with remaining mushrooms.
In the same skillet, melt the remaining butter and add garlic. Cook for a minute, then sprinkle in flour and stir until golden. Gradually add reserved poaching liquid, stirring until thickened. Mix in cheddar cheese until melted.
Preheat oven to 180°C (350°F). In a baking dish, layer white sauce, lasagna sheets, half the chicken, and half the mushrooms. Repeat layers, finishing with lasagna sheets and white sauce. Top with mozzarella cheese.
Cover with foil and bake for 25 minutes. Remove foil and bake for another 10 minutes until golden and bubbly. Let it rest before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.