Leftover Turkey Breast Casserole Recipe with Noodles

This leftover turkey breast casserole combines tender cooked turkey, egg noodles, vegetables, and a creamy homemade sauce under a crisp, cheesy topping. It is a practical way to turn refrigerated holiday or weeknight leftovers into a complete oven-baked dinner, and the vegetables and seasonings are easy to adjust to what you have.

Ingredients

12 oz (340 g) wide egg noodles
4 tbsp (56 g) unsalted butter, divided
1 small yellow onion, about 1 cup (150 g), finely diced
2 medium celery ribs, about 1 cup (100 g), diced
8 oz (225 g) cremini or white mushrooms, sliced
2 cloves garlic, minced, about 2 tsp (6 g)
1/4 cup (32 g) all-purpose flour
1 1/2 cups (360 ml) low-sodium chicken or turkey broth
1 cup (240 ml) whole milk
1 tsp (5 ml) Dijon mustard
1/2 tsp dried thyme (about 0.5 g)
1/2 tsp fine salt (about 3 g), plus salt for the noodle water
1/4 tsp ground black pepper (about 0.5 g)
3 cups (420 g) cooked turkey breast, cut into bite-size pieces
1 cup (130 g) frozen peas, thawed
1 cup (110 g) shredded sharp cheddar, divided
1/2 cup (30 g) panko breadcrumbs
1 tbsp (15 ml) olive oil
1 tbsp (14 g) butter, melted, for the topping

Instructions

Heat the oven to 375°F (190°C). Lightly butter or oil a 9-by-13-inch (23-by-33-cm) baking dish. Set out the cooked turkey and thawed peas so they are ready to stir into the sauce. If the turkey is in large slices, cut it into roughly 1-inch (2.5-cm) pieces for even portions.
Bring a large pot of salted water to a boil. Cook the egg noodles for about 1 minute less than the package’s suggested time, usually 7 to 8 minutes, so they remain slightly firm. Drain them well; do not rinse, since a little starch helps the sauce cling. While they cook, begin the vegetables and sauce in the next step.
Melt 3 tablespoons (42 g) of the butter in a large saucepan or deep skillet over medium heat. Add the onion, celery, and mushrooms. Cook for 6 to 8 minutes, stirring now and then, until the onion is soft and the mushrooms have released most of their moisture. Stir in the garlic and cook for 30 seconds, just until fragrant.
Add the remaining 1 tablespoon (14 g) butter. When it melts, sprinkle in the flour and stir for about 1 minute to coat the vegetables and cook away the raw-flour taste. Gradually pour in the broth while whisking, then whisk in the milk, Dijon, thyme, salt, and pepper. Bring the sauce to a gentle simmer, stirring frequently, and cook for 3 to 5 minutes until it thickens enough to coat a spoon. Keep it at a gentle simmer rather than a hard boil.
Take the pan off the heat. Fold in the turkey, peas, drained noodles, and 3/4 cup (about 82 g) of the cheddar. Transfer the mixture to the prepared dish and spread it into an even layer. In a small bowl, stir together the panko, olive oil, melted butter, and remaining 1/4 cup (about 28 g) cheddar. Scatter the topping evenly over the casserole.
Bake uncovered for 22 to 25 minutes, until the edges are bubbling and the top is golden. Check the center with a food thermometer; USDA FSIS guidance says reheated leftovers should reach 165°F (74°C). If the top browns before the center reaches that temperature, loosely cover the dish with foil and continue baking, checking again after a few minutes.
Let the casserole rest for 10 minutes before serving. The sauce will settle and thicken slightly as it rests, making portions easier to lift. Serve while hot.

Tips

Use turkey that has been stored safely. Refrigerate cooked turkey within 2 hours of cooking, and use refrigerated leftovers within 3 to 4 days. If it has been sitting at room temperature longer than 2 hours, do not use it in the casserole.
Keep the noodles a little underdone before baking. They continue to soften as the casserole heats, and fully tender noodles can turn mushy after absorbing sauce in the oven. Drain thoroughly so extra water does not thin the filling.
Make the sauce thick but pourable before adding the noodles. If it looks too thick, stir in broth a tablespoon at a time. If it seems thin, simmer it for another minute or two; a watery sauce can make the finished casserole loose.
Cut the turkey into similar-sized pieces and fold it in after the sauce is finished. This helps distribute it evenly and avoids extended stovetop cooking, which can make already-cooked breast meat dry. Use low-sodium broth if your turkey is seasoned or salted.

Serving Suggestions

This casserole is filling enough to serve as a main course. For a fresh contrast to its creamy filling and crunchy top, offer a green salad dressed with a simple vinaigrette, or serve it with steamed green beans, roasted broccoli, or sautéed spinach. A spoonful of cranberry sauce can work alongside the meal if you enjoy the sweet-tart flavor with turkey, but it is optional rather than part of the casserole.

For a casual family dinner, bring the baking dish to the table and serve with a large spoon or spatula. If the casserole is part of a larger holiday-leftover meal, cut smaller portions and add a crisp vegetable side so the plate does not feel too heavy. The recipe already includes noodles, turkey, peas, and mushrooms, so there is no need to add another starch unless you are serving a crowd.

Variations

Change the vegetables: Replace the peas with an equal amount of thawed frozen green beans, corn, or a mixed vegetable blend. Chopped cooked carrots also work. Drain vegetables that release liquid, and avoid adding them frozen because they can cool the sauce and leave extra moisture in the dish.

Use different cooked poultry: An equal amount of cooked chicken breast or thigh meat can stand in for turkey. If the meat is strongly seasoned, taste the sauce before adding the measured salt. For a darker, richer flavor, use a mix of turkey breast and thigh meat.

Swap the noodles: Use 12 oz (340 g) of another short pasta, such as rotini or penne, cooked just shy of tender. Their shape changes the texture but still holds the sauce. If using a gluten-free pasta, cook it according to its package directions and check early, since some varieties become soft quickly in the oven.

Adjust the topping or sauce: Monterey Jack or Swiss can replace cheddar, with a milder or nuttier result. For a more herb-forward casserole, add 1 tablespoon (about 4 g) chopped fresh parsley after baking. To make the sauce without wheat flour, use a gluten-free all-purpose flour blend in the same amount; thickening can vary by blend, so simmer until the sauce coats a spoon before mixing in the other ingredients.

Storage and Reheating

Let leftovers cool briefly, then refrigerate them in a shallow airtight container within 2 hours of baking. Keep the casserole refrigerated for 3 to 4 days. You can store the whole dish covered if it will fit safely in your refrigerator, but dividing it into smaller containers helps it cool more quickly and makes reheating individual servings easier.

To reheat a single portion, cover it loosely and microwave, stirring or turning the portion halfway through if possible, until steaming hot throughout. For a larger amount, put it in an oven-safe dish, cover with foil, and warm at 350°F (175°C); add a spoonful or two of broth or milk if the noodles look dry. Heat leftovers to 165°F (74°C), checked at the center with a food thermometer. Remove the foil near the end if you want to crisp the topping again.

To freeze, cool the casserole promptly and package it airtight, either in one portion or individual servings. For best texture, use within 2 to 3 months. Thaw overnight in the refrigerator before reheating, or warm from frozen in a covered oven-safe dish at 350°F (175°C), allowing extra time and checking that the center reaches 165°F (74°C). The noodles may soften slightly after freezing, but the casserole remains a convenient make-ahead meal.

Frequently Asked Questions

Can I make leftover turkey casserole ahead of time?

Yes. Assemble the casserole without the panko topping, cover it, and refrigerate it for up to 24 hours. Keep the topping separate so it stays crisp, then scatter it over the dish just before baking. Because the assembled casserole starts cold, it may need extra oven time; check the center with a thermometer and heat it to 165°F (74°C).

Should I use cooked or raw turkey breast?

This recipe is written for cooked turkey breast, such as properly refrigerated leftovers. It is not designed to cook raw turkey pieces in the sauce, since the noodles and sauce could be done before the poultry is safe. If starting with raw turkey, cook it separately to 165°F (74°C), then cool and use it in the recipe.

Can I make it without mushrooms?

Yes. Leave them out and use an extra cup of celery, peas, or another vegetable, or simply make the sauce without a replacement. Mushrooms add a savory flavor and moisture, so taste the sauce before assembling and adjust the seasoning if you omit them.

Why is my casserole dry?

Common causes are overcooked noodles, a sauce that was reduced too far, or baking the dish longer than needed. Keep the noodles slightly firm, stop simmering once the sauce coats a spoon, and use the thermometer to avoid unnecessary oven time. If the mixture looks dry before baking, stir in a little broth or milk.

Can I use canned cream soup instead of making the sauce?

You can, though the flavor and texture will differ. For a shortcut, mix one 10.5-oz (298-g) can of condensed cream of mushroom or chicken soup with about 1 cup (240 ml) of milk or broth, then season to taste. The filling will be more concentrated and may be saltier, so choose low-sodium soup when available and check the casserole’s center reaches 165°F (74°C).

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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