Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch white ceramic or glass casserole dish with cooking spray or a thin swipe of oil.
Pat the chicken breasts dry with paper towels and trim any excess fat. If they are very thick, slice them in half horizontally so they bake evenly and stay tender.
Lay the chicken breasts in a single layer in the prepared casserole dish, fitting them snugly but without overlapping too much.
Raw chicken arranged in a white casserole dish before baking
In a medium bowl, stir together the condensed golden mushroom soup and sour cream until completely smooth and blended. This is your creamy sauce base.
Sprinkle about half of the crispy fried onions evenly over the chicken in the casserole dish. This gives a flavorful layer that softens slightly under the sauce.
Pour the soup and sour cream mixture over the chicken and onions, spreading with a spoon or spatula so every piece of chicken is well coated and the sauce reaches the edges of the dish.
Creamy sauce being spread over chicken in the casserole dish
Cover the casserole tightly with foil and bake in the preheated oven for 30 minutes, until the sauce is bubbling and the chicken is starting to turn opaque.
Carefully remove the foil, then sprinkle the remaining crispy fried onions evenly over the top of the saucy chicken to form a crunchy topping.
Return the uncovered casserole to the oven and bake for another 15–20 minutes, or until the chicken is cooked through (an instant-read thermometer should read 165°F in the thickest part) and the onions on top are golden and crisp.
Crispy fried onions being added to the bubbling casserole
Let the casserole rest for 5–10 minutes before serving so the sauce can thicken slightly. Use a large serving spoon to lift portions, making sure to scoop from the bottom so each serving has chicken, creamy golden mushroom sauce, and plenty of crispy onion topping.
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