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Instructions
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Preheat Oven:
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Heat oven to 375°F (190°C).
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Brown the Chicken:
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Heat olive oil in a large skillet over medium heat.
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Season chicken with salt and pepper, then cook for 4 minutes per side until lightly browned. Remove and set aside.
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Sauté Vegetables:
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In the same skillet, add onions, mushrooms, and garlic. Cook for 5 minutes until softened.
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Prepare the Sauce:
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In a bowl, mix cream of mushroom soup, sour cream, thyme, salt, and pepper until smooth.
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Assemble the Casserole:
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Place chicken in a 9×13-inch baking dish.
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Spread the sautéed vegetables over the chicken, then pour the sauce evenly on top.
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Sprinkle with cheddar cheese (and breadcrumb topping, if using).
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Bake:
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Cover with foil and bake for 25 minutes.
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Uncover and bake 10 more minutes until cheese is bubbly and golden.
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Serve:
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Let rest 5 minutes before serving.
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Expert Tips
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Make Ahead: Assemble the casserole, cover, and refrigerate for up to 24 hours before baking (add 5-10 minutes to cooking time if chilled).
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Extra Flavor: Stir ½ tsp paprika or 1 tsp Dijon mustard into the sauce for a flavor boost.
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Serving Suggestion: Pairs well with steamed green beans, rice, or a fresh salad.
Enjoy this creamy, comforting dish—perfect for company or a cozy night in!
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