Easy Leftover Chicken and Potato Casserole

Leftover Chicken Casserole
The Spruce
  • Total: 50 mins
  • Prep: 15 mins
  • Cook: 35 mins
  • Yield: 4 servings
Nutritional Guidelines (per serving)
915 Calories
53g Fat
57g Carbs
52g Protein
See Full Nutritional Guidelines Hide Full Nutritional Guidelines
Nutrition Facts
Servings: 4 servings
Amount per serving
Calories 915
% Daily Value*
Total Fat 53g 68%
Saturated Fat 26g 128%
Cholesterol 193mg 64%
Sodium 1091mg 47%
Total Carbohydrate 57g 21%
Dietary Fiber 6g 22%
Protein 52g
Calcium 450mg 35%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

This chicken and potato casserole is easy to prepare with leftover chicken and potatoes. This makes a nice everyday meal using the leftovers from a Sunday chicken dinner, or use a cooked rotisserie chicken or leftovers from roasting a whole bird and cook the diced potatoes separately.

Leftover chicken can become dry and a little blah, but combining with a creamy sauce and baking until bubbly gives it new life. Revive your leftovers by turning them into a totally new dish that the whole family will love.

This easy chicken casserole can be topped with a cup of shredded cheddar cheese or a crunchy buttered bread crumb topping. Crushed French fried onions would be delicious as well.


Click Play to See This Leftover Chicken and Potato Casserole Recipe Come Together


  • 3 tablespoons butter
  • 8 ounces mushrooms (sliced)
  • 1 cup onions (chopped)
  • 2 tablespoons all-purpose flour
  • 1 cup milk (or half-and-half)
  • Kosher salt (to taste)
  • Freshly ground black pepper (to taste)
  • 2 cups diced chicken (cooked)
  • 2 cups diced potatoes (cooked)
  • Optional: 1 cup soft breadcrumbs
  • Optional: 2 tablespoons butter (melted)
  • Optional: 1 cup cheddar cheese (or Monterey Jack cheese, shredded)

Steps to Make It

  1. Gather the ingredients.

    Ingredients for leftover chicken casserole
    The Spruce
  2. Heat the oven to 350 F / 180 C / Gas 4.

  3. Lightly grease a 1 1/2-quart baking dish.

    Casserole dish
     The Spruce
  4. Heat the butter in a large, heavy skillet or sauté pan over medium heat.

  5. Add the mushrooms and onions and cook until tender and lightly browned, about 8 minutes.

    Sauteing the onions and mushrooms
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  6. Stir the flour into the pan. Cook, stirring, for 1 to 2 minutes.

    Adding flour to the saute pan
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  7. Gradually add the milk or half-and-half, stirring, and cooking until thickened. Add salt and pepper, to taste.

    Adding milk to the saute pan
    The Spruce
  8. In the prepared baking dish, combine the cooked chicken, potatoes, and mushroom sauce mixture. 

    Chicken, potatoes, and mushroom in a baking dish
    The Spruce
  9. If using the breadcrumb topping, toss the breadcrumbs with the melted butter until well coated.

    Bread crumbs with melted butter
    The Spruce
  10. Top with the buttered bread crumbs or sprinkle with shredded cheese.

    Casserole with cheese ready to be baked
    The Spruce
  11. Bake for 25 to 30 minutes, or until hot and bubbly. Enjoy!

    Leftover Chicken and Potato Casserole Recipe
     The Spruce

Recipe Variations

  • Other cooked vegetables may be used along with the potatoes. Add 1/2 cup or more of diced cooked rutabaga or carrots either in place of or in addition to the mushrooms.
  • Add a big handful of frozen peas or frozen spinach that has been thawed, squeezed dry, and chopped.

How to Store and Freeze

  • If well-wrapped, this casserole can be stored in the fridge for up to a day before baking or frozen for a month. Defrost in the refrigerator overnight before baking and add five minutes to the cook time.
  • Leftover cooked chicken will last up to four days in an airtight container in the refrigerator. It can also be stored in the freezer for up to a month. Defrost overnight in the fridge before using, and use right away upon thawing.