Tasty Chicken and Potato Casserole

Featured in: Main Dishes

This warming dish turns yesterday's chicken and potatoes into something new with a rich mushroom sauce. Pick between a cheesy top or crunchy breadcrumbs to finish it off nicely.
Twistytaste.com
Updated on Wed, 23 Apr 2025 20:44:48 GMT
A creamy casserole topped with golden breadcrumbs and garnished with parsley. Pin it
A creamy casserole topped with golden breadcrumbs and garnished with parsley. | twistytaste.com

Got a brilliant hack for turning yesterday's meal into tonight's feast! My all-time fave Chicken and Potato Leftovers Casserole works wonders on those nights when you need something cozy. There's something truly magical about how the juicy chicken pieces, velvety mushroom mixture, and chunky potatoes come together in this dish.

Effortless Yet Impressive

The best thing about this dish is how it takes regular leftovers and transforms them into something your family will actually look forward to eating. Everything blends beautifully with the smooth white sauce, and you can toss in whatever extras you've got hiding in your fridge to make it uniquely yours.

Round Up These Items

  • Butter: Get the unsalted kind for cooking and maybe the bread topping too.
  • Onions: Diced up for that foundation of flavor.
  • Mushrooms: Fresh ones cut into slices add wonderful depth.
  • All-Purpose Flour: This makes your mushroom sauce nice and thick.
  • Milk (or Half-and-Half): The key to that smooth, luscious sauce.
  • Cooked Chicken: Chunks from last night's rotisserie or roasted bird.
  • Cooked Potatoes: Cut up leftovers from roasting or steaming.
  • Shredded Cheese (Optional): Some Monterey Jack or cheddar for extra yumminess.
  • Breadcrumbs (Optional): Soft ones mixed with melted butter for that crunchy top.

Building Satisfaction

Step 1 - Get Your Oven Hot
Set your oven to 350°F (180°C) and lightly coat a 2-quart dish with cooking spray.
Step 2 - Cook the Veggies
Melt 3 tablespoons butter in a pan over medium heat. Toss in your sliced mushrooms and diced onions, and let them cook about 8 minutes until they're soft and golden.
Step 3 - Whip Up the Sauce
Mix in 2 tablespoons flour and let it cook 1-2 minutes. Slowly pour in 1 cup milk or half-and-half while stirring constantly until it gets thick, around 3-5 minutes. Throw in some salt and pepper to your liking.
Step 4 - Mix Everything Together
Put 2 cups diced cooked potatoes and 2 cups diced cooked chicken in your greased dish, then pour the mushroom mixture over. Gently stir it all up.
Step 5 - Finish the Top
If you want breadcrumbs, mix 1 cup of them with 2 tablespoons melted butter. Or just sprinkle 1 cup shredded cheddar on top instead.
Step 6 - Into the Oven
Bake it for 25-30 minutes until everything's hot and bubbling. Eat it right away!

Winning Tips

From making this tons of times, I've learned a few tricks: pour your milk in gradually to keep the sauce smooth, and always sample before baking since everything's already cooked. Don't have the right dish? Any oven-safe pan works fine! Just don't put cold glass straight into a hot oven.

Personal Touches

The fun part is switching things up! Sometimes I throw in frozen peas or leftover broccoli. Fresh parsley and thyme really wake up the flavors. And for something really tasty on top, try those canned French-fried onions!

Storage Smarts

You can put this together a day ahead and keep it in the fridge until you're ready to cook. It even freezes well for up to a month! Just add a bit more time in the oven if you're cooking it straight from the refrigerator.

A creamy casserole topped with golden breadcrumbs, featuring mushrooms and potato slices, is baked in a white dish on a dark surface next to a blue napkin and spoon. Pin it
A creamy casserole topped with golden breadcrumbs, featuring mushrooms and potato slices, is baked in a white dish on a dark surface next to a blue napkin and spoon. | twistytaste.com

Tasty Companions

We always serve this with a simple green salad to cut through the richness. Some quick cooked greens or whatever veggies are in season also work great alongside. It's all about creating that ultimate comfort dinner!

Frequently Asked Questions

→ What kind of potatoes work best in this casserole?
You can throw in any cooked potatoes you've got leftover - roasted, boiled, or even mashed. If you're using mashed, just spread them as a layer instead of mixing them in. Red or yellow potatoes keep their shape better than russets when baked.
→ Can I make this casserole ahead of time?
You sure can put this together up to a day ahead and keep it in the fridge before cooking. Just add about 10-15 minutes more to your baking time when cooking from cold. It's best to wait and add your breadcrumbs or cheese right before you pop it in the oven.
→ What can I substitute for mushrooms?
Don't like mushrooms? Try chopped celery, carrots, or peas instead. Aim for about 1 cup of veggies total so your sauce stays balanced. Those frozen mixed veggie bags work great too if you need a quick swap.
→ Can I freeze this casserole?
You can freeze it, but the cream sauce might look a bit different when thawed. If you want to freeze it, put it together without the topping and it'll keep for up to 2 months. Let it thaw in your fridge overnight, then add the topping and bake it.
→ What can I use instead of half-and-half?
Regular milk works for a lighter version or heavy cream if you want it extra rich. If you can't do dairy, unsweetened almond or oat milk can work, but your sauce won't be as creamy. You might need to play with the flour amount to get the thickness right.

Conclusion

This filling chicken potato dish is the best way to use up extra food in your fridge.

Mixing tender chicken, rich sauce, and tasty mushrooms, it turns simple leftovers into a delicious, warming meal that everyone at your table will love.

Creamy Potato Chicken Dish

A rich dish mixing extra chicken and potatoes with mushrooms and onions, finished with either melted cheese or crunchy buttered breadcrumbs.

Prep Time
15 Minutes
Cook Time
30 Minutes
Total Time
45 Minutes

Category: Main Dishes

Difficulty: Intermediate

Cuisine: American

Yield: 6 Servings (6 servings)

Dietary: ~

Ingredients

01 3 tbsp butter, unsalted.
02 8 ounces sliced mushrooms.
03 1 cup diced onions.
04 2 tbsp flour for thickening.
05 1 cup milk or cream.
06 Black pepper, ground fresh.
07 Table salt or kosher salt.
08 2 cups potatoes, already cooked and diced.
09 2 cups chicken, cooked and cut into chunks.
10 1 cup breadcrumbs, fresh (if wanted).
11 2 tbsp melted butter (if wanted).
12 1 cup grated cheddar or Monterey Jack (if wanted).

Instructions

Step 01

Set your oven to 350 F/180 C/Gas 4. Give a 2-quart baking dish a light coating of oil or butter.

Step 02

Melt butter in your skillet over medium flame. Toss in mushrooms with onions and cook until they're soft and golden, around 8 minutes.

Step 03

Sprinkle flour into the pan and stir for 1-2 minutes. Slowly pour in milk while stirring continuously until it gets thick, about 3-5 minutes. Add salt and pepper to your liking.

Step 04

Put your cooked potatoes and chicken in the greased dish, then pour the mushroom gravy over everything.

Step 05

Sprinkle your choice of topping - either breadcrumbs mixed with melted butter or a layer of shredded cheese.

Step 06

Pop in the oven for 25-30 minutes until it's bubbling and hot throughout.

Notes

  1. You can pick either cheese or buttery breadcrumbs for the top - both work great.
  2. This is a smart way to use up yesterday's chicken and potatoes.

Tools You'll Need

  • Baking dish (2-quart size).
  • Deep frying pan or skillet.

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains milk products.
  • Has wheat products.

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 403
  • Total Fat: 19 g
  • Total Carbohydrate: 33 g
  • Protein: 26 g