Sheet Pan Chicken with Mushroom-Onion Sauce

Sheet pan with chicken, carrots and potatoes with a mushroom sauce

Chicken, carrots and potatoes are topped with a hearty mushroom-onion sauce and then baked on a sheet pan. So easy, so delicious!



Mushroom Sauce

1 tablespoon butter

1 tablespoon olive oil

8 ounces sliced mushrooms (I like to use baby bella/cremini)

1 medium onion, cut in half and thinly sliced

1 teaspoon chopped garlic (around 2 cloves)

3 tablespoons all-purpose flour

1 1/2 cups milk (whole, 2% or skim)

1/2 cup dry white wine

1 teaspoon dried sage

2 tablespoons beef broth concentrate (I like Better than Bouillon brand)

2 tablespoons tomato paste

Kosher salt, to taste

Ground pepper, to taste

Sheet Pan Chicken

1 1/2 to 2 pounds boneless, skinless chicken thighs or breasts

4 medium carrots, peeled and cut into 1/4-inch slices

8 fingerling potatoes (around 2-inches in length)

3 or 4 sprigs of fresh thyme

Chopped fresh parsley, for garnish


Preheat oven to 350 degrees. Spray a half-sheet pan with nonstick cooking spray.

Mushroom Sauce

  1. In a large skillet or sauté pan over medium heat, add the butter and oil; cook until butter is melted and oil is hot. Add mushrooms, onion and garlic and cook until most of the mushroom moisture has evaporated, and the mushrooms and onion are beginning to turn a light golden brown. Reduce heat to low, sift in flour and continue cooking, stirring, for 3 minutes.
  2. Whisk in the milk, wine, sage, beef broth concentrate and tomato paste. Cook over medium-low heat, stirring, until sauce thickens. Season to taste with salt and pepper. Remove from heat and set aside. (It will thicken as it sits, and that’s okay. Just stir it a time or two.)

Sheet Pan Chicken

  1. If using chicken breasts, butterfly and halve larger pieces. Season chicken to taste with salt and pepper.
  2. Arrange chicken pieces on prepared pan in one layer, smooth side up. Arrange carrots and potatoes around chicken. Stick thyme sprigs in and around all the ingredients. Spoon mushroom sauce over the top. Cover with foil and bake for 30 to 40 minutes, or until chicken reaches an internal temperature of 165 degrees on an instant read thermometer. Carrots and potatoes should also be tender. Remove thyme sprigs; sprinkle with parsley and serve.


Note on cook time: The thickness of your chicken pieces, not the carrots or potatoes, will determine how long you need to bake this dish.

Make ahead: mushroom sauce can be made up to 24 hours in advance, covered and refrigerated.

© A Well-Seasoned Kitchen ®