Creamy Leftover Chicken Casserole
This creamy leftover chicken casserole turns last night’s roast into a fresh, satisfying dinner without any real work. It comes together in about 35 minutes and uses mostly things you already have.
A can of soup, some pasta, frozen vegetables, and a handful of cheese make a bubbling dish that feels more put-together than the sum of its parts. The crunchy cracker topping seals the deal.
Why This Casserole Works So Well
It solves the what’s for dinner puzzle when the fridge looks bare and your energy is low. You need cooked chicken, one can of soup, and some cheese, and everything else flexes around what you have on hand.
The sauce stays creamy and rich without a single pot to clean, the vegetables add a little sweetness and color, and that buttery topping gives every bite a real crunch. It’s one of those meals that tastes like you planned ahead, even when you didn’t.
Ingredients
- 2 cups cooked shredded or diced chicken: rotisserie, leftover roast, or poached chicken all work.
- 8 oz dry pasta (rotini or penne): cooked al dente and drained.
- 1 cup frozen mixed vegetables (peas, carrots, corn): no need to thaw them.
- 1 can (10.5 oz) condensed cream of chicken soup: use the regular can, not the light one if you want full creaminess.
- 1/2 cup sour cream: adds a gentle tang and extra richness.
- 1/2 cup whole milk: thins the sauce so it coats everything evenly.
- 1 cup shredded sharp cheddar cheese, divided: sharp cheddar gives the best flavor, but any melting cheese will do.
- 1/2 tsp garlic powder
- 1/4 tsp onion powder
- Salt and black pepper, to taste
- 1/2 cup crushed butter crackers (about 10 to 12 crackers): Ritz or similar.
- 2 tbsp melted butter: for tossing with the cracker crumbs.
Variations / Substitutions
- Swap the chicken for turkey: leftover roast turkey or even ground turkey browned in a skillet works beautifully.
- Make it dairy-free: use a dairy-free condensed soup, plant-based sour cream, oat milk, and a dairy-free shredded cheese that melts well.
- Add a little heat: stir in a pinch of red pepper flakes with the seasonings.
- Fresh herbs: chopped fresh thyme or parsley folded in right before baking brightens everything up.
- No crackers on hand: panko breadcrumbs or crushed cornflakes mixed with butter give a similar crunch.
If you have leftover turkey instead of chicken, our Turkey Pot Pie Casserole is another great way to use it up.
How to Make Leftover Chicken Casserole
Step 1: Mix the Creamy Sauce
In a large bowl, whisk together the 10.5 oz can of condensed cream of chicken soup, 1/2 cup sour cream, 1/2 cup milk, 1/2 tsp garlic powder, 1/4 tsp onion powder, and a pinch each of salt and pepper. You want the mixture smooth and even, no streaks of sour cream left.
The sauce will look thin and pale at this stage, and that is exactly what you want. It thickens up as the casserole bakes and turns into a rich, velvety blanket around the chicken and pasta.
Step 2: Fold in the Chicken, Pasta, and Veggies
Add the 2 cups cooked chicken, the drained pasta, and the 1 cup frozen vegetables right into the bowl. Sprinkle in 3/4 cup of the shredded cheddar and fold everything together gently, scraping the bottom so the sauce coats every piece.
The mixture looks a little wet and messy now, with frozen peas scattered through like little green pebbles. Don’t worry if it feels soupy; that extra liquid steams the vegetables and melts into the pasta as it bakes.
Step 3: Transfer to the Baking Dish
Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish and scrape the entire mixture into it, spreading it into an even layer with the back of your spoon.
At this point, the casserole is just a creamy lumpy canvas waiting for its crunchy lid. The surface will look beige and speckled, and that top layer of cheese is still hiding underneath.
Step 4: Add the Buttery Cracker Crust
In a small bowl, toss the 1/2 cup crushed crackers with the 2 tbsp melted butter until they look like wet sand. Sprinkle this evenly over the top of the casserole, then scatter the remaining 1/4 cup cheddar right on top of the crumbs.
The cheese melts down through the crumb layer as it bakes, and the butter in the crumbs fries them into a deep golden crust. You get little pockets of melted cheese mixed with crispy bits in every scoop.
Step 5: Bake and Serve
Slide the dish into the oven and bake for 20 to 25 minutes. You will know it is ready when the edges are bubbling hard and the top is a deep golden brown. Let it sit on the counter for about 5 minutes so the sauce settles, then scoop big spoonfuls onto plates.
Serve it hot, while the cheese is still stretchy and the cracker crust is at its crunchiest. A big serving spoon works best here because you want to dig all the way to the bottom and catch every layer in one go.
A Few Notes Before You Start
- Rotisserie chicken is your best friend for this recipe. It saves the step of cooking chicken from scratch and adds a little extra savory depth from the seasoned skin.
- Do not thaw the frozen vegetables. They release just the right amount of moisture as the casserole bakes and keep a nice texture without turning to mush.
- You can assemble the whole casserole (without the topping) up to a day ahead and store it covered in the fridge. When you are ready to bake, add the cracker topping, then pop it in the oven, adding about 10 minutes to the bake time.
- For a darker, crispier crust, switch the oven to broil for the last 1 to 2 minutes, watching it closely so the crumbs do not burn.
Keeping Leftovers Fresh
- Refrigerate: covered tightly, it keeps well for up to 4 days.
- Reheating: warm individual portions in the microwave, or cover the whole dish with foil and reheat in a 350°F (175°C) oven for about 15 minutes.
What to Serve With This Casserole
A simple green salad with lemon vinaigrette is the perfect partner; the acidity cuts right through the richness of the cream sauce. Roasted broccoli or quick steamed green beans add a fresh, slightly bitter note that balances the cheesy casserole. And if you have a jar of cranberry sauce in the fridge, a small spoonful on the side gives a sweet-tart contrast that works surprisingly well with the savory chicken.
Frequently Asked Questions
Can I use rice instead of pasta?
Yes, swap in 2 cups of cooked white or brown rice. The dish will be a little denser and feel more like a baked pilaf.
How can I make this without canned soup?
Whisk together 3 tbsp butter, 3 tbsp flour, and 1 1/2 cups whole milk in a saucepan. Cook until thickened, season with salt, pepper, and a pinch of chicken bouillon powder, then use that in place of the can of soup.
Can I freeze this casserole?
Yes. Assemble it without the cracker topping, wrap tightly, and freeze for up to 3 months. Thaw overnight in the fridge, then add the topping and bake as directed, adding about 10 extra minutes.
What if I don’t have butter crackers?
Panko breadcrumbs or crushed plain cornflakes tossed with melted butter work just as well. The texture will be slightly lighter, but still crisp.
Creamy Leftover Chicken Casserole Recipe
Ingredients
Method
- In a large bowl, whisk together the cream of chicken soup, sour cream, milk, garlic powder, onion powder, salt, and pepper until smooth.
- Fold in the chicken, cooked pasta, frozen vegetables, and 3/4 cup of the cheddar until everything is evenly coated.
- Preheat oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish. Pour the mixture in and spread it into an even layer.
- Combine crushed crackers and melted butter, sprinkle over the top, then scatter the remaining 1/4 cup cheddar on top.
- Bake for 20 to 25 minutes until edges are bubbling and the top is deep golden. Let rest 5 minutes, then scoop onto plates and serve hot.
