Thanksgiving Leftover Turkey Casserole

Introduction

Thanksgiving is a time of warmth, family, and an abundance of delicious food. While the roasted turkey, stuffing, cranberry sauce, and mashed potatoes are the stars of the holiday table, one of the most cherished traditions that follows is making creative use of the leftovers. Enter the Thanksgiving Leftover Turkey Casserole—a comforting, hearty, and flavorful dish that transforms your post-holiday remnants into a second act worthy of celebration. This casserole brings together the best flavors of Thanksgiving in a creamy, baked format that’s perfect for cozy evenings or weekend meals. Whether you’re feeding a crowd or simply enjoying a nostalgic bite, this recipe ensures nothing goes to waste while delivering a satisfying meal that feels both familiar and exciting.

The History

The concept of repurposing holiday leftovers into casseroles has deep roots in American culinary tradition. Originating in the early 20th century with the rise of convenience cooking and canned goods, casseroles became a staple in mid-century American kitchens. The invention of the casserole as we know it today was popularized by companies like Campbell Soup, which promoted recipes using their condensed soups as creamy bases. In the context of Thanksgiving, families have long sought ways to extend the joy of the holiday feast beyond a single day. With large turkeys often yielding more meat than can be consumed immediately, resourceful cooks began layering leftover turkey with stuffing, vegetables, and gravy into baking dishes. Over time, these improvised meals evolved into beloved recipes passed down through generations. The Thanksgiving Leftover Turkey Casserole stands as a testament to American ingenuity—transforming surplus into something soul-satisfying, economical, and deeply connected to family heritage and seasonal gratitude.

Ingredients Breakdown

The beauty of this casserole lies in its flexibility, but having a clear understanding of each ingredient helps you balance flavors and textures perfectly:

Cooked Turkey Meat: The star protein, shredded or diced from your roasted Thanksgiving bird. Opt for white and dark meat for variety in texture.
Leftover Stuffing or Dressing: Adds heartiness and a savory, herby backbone. Use homemade or store-bought; cubed cornbread or herb stuffing works well.
Mashed Potatoes: Acts as a creamy binder and topping. Leftover mashed potatoes are ideal, especially if they’re buttery and slightly seasoned.
Vegetables: Typically includes peas, carrots, and celery—ingredients already present in many Thanksgiving sides. Frozen mixed vegetables work great here.
Onion and Garlic: For aromatic depth. Sautéed gently before mixing in.
Butter: Used to sauté vegetables and enrich the filling.
Flour: A thickener for the sauce base when making a roux.
Chicken or Turkey Broth: Enhances flavor and adds moisture without overpowering the dish.
Heavy Cream or Half-and-Half: Gives the sauce a rich, velvety texture.
Whole Milk: Can substitute part of the cream for a lighter version.
Dijon Mustard (optional): Adds a subtle tang that brightens the overall flavor profile.
Dried Herbs: Thyme, sage, rosemary, and parsley echo traditional Thanksgiving seasoning.
Salt and Black Pepper: Essential seasonings adjusted to taste.
Cream of Chicken or Mushroom Soup (optional): Some versions use canned soup for convenience and creaminess.
Cheese (optional): Sharp cheddar or Parmesan can be sprinkled on top for a golden, melty crust.
Panko Breadcrumbs or Crushed Crackers (optional): For added crunch on the surface.

Each component contributes not just to taste but also to the layered structure of the casserole, creating a harmonious blend reminiscent of the original feast.

Step-by-Step Recipe

Preheat Oven: Begin by preheating your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with butter or non-stick spray.
Prepare Vegetables: In a large skillet over medium heat, melt 3 tablespoons of butter. Add 1 chopped onion and 2 minced garlic cloves, sautéing until translucent (about 3–4 minutes). Stir in 1 cup of frozen peas and carrots, cooking for another 4–5 minutes until tender. Set aside.
Make the Sauce: In the same skillet, melt 4 tablespoons of butter. Whisk in 1/3 cup all-purpose flour and cook for 1–2 minutes to form a roux. Gradually pour in 2 cups of warm chicken or turkey broth, stirring constantly to avoid lumps. Add 1 cup heavy cream or half-and-half and continue stirring until the mixture thickens (about 5–7 minutes).
Season the Sauce: Stir in 1 teaspoon dried thyme, 1/2 teaspoon rubbed sage, 1/2 teaspoon dried rosemary, 1 tablespoon Dijon mustard (if using), salt, and freshly ground black pepper to taste. Simmer for 2 more minutes, then remove from heat.
Combine Ingredients: In a large mixing bowl, combine 3 cups of shredded cooked turkey, the sautéed vegetables, 2 cups of leftover stuffing (broken into small pieces), and any remaining Thanksgiving veggies like green beans or sweet potatoes (optional). Pour the warm sauce over the mixture and stir gently until everything is evenly coated.
Layer the Casserole: Spread half of the turkey mixture into the prepared baking dish. Top with 1–2 cups of mashed potatoes, spreading them evenly with a spatula to create a smooth layer. Add the remaining turkey mixture on top of the potatoes.
Add Final Topping: Spoon the rest of the mashed potatoes over the top, covering completely. Use a fork to create ridges, which will help the top brown nicely. Optionally, sprinkle 1/2 cup shredded cheddar cheese and 1/4 cup panko breadcrumbs over the surface for extra flavor and crunch.
Bake: Place the casserole in the preheated oven and bake for 25–30 minutes, or until the filling is bubbling around the edges and the top is golden brown. If needed, broil for 2–3 minutes at the end to deepen the color (watch closely to prevent burning).
Rest Before Serving: Let the casserole sit for 5–10 minutes after removing it from the oven. This allows the sauce to set slightly, making it easier to serve neatly.

Tips

Use Room-Temperature Leftovers: Bringing cold turkey, stuffing, and mashed potatoes to room temperature before assembling prevents uneven cooking.
Don’t Overmix: When combining ingredients, gentle folding preserves texture, especially for mashed potatoes and stuffing.
Adjust Sauce Consistency: If the sauce seems too thick, add more broth or milk. Too thin? Simmer longer or add a bit more roux.
Taste As You Go: Season gradually and taste the filling before baking. Leftovers vary in saltiness, so adjust accordingly.
Grease the Dish Well: Prevents sticking and makes cleanup easier.
Let It Rest: Allowing the casserole to rest ensures cleaner slices and better texture.
Reheating Tip: Cover with foil when reheating leftovers to retain moisture and prevent drying out.
Freeze Ahead: Assemble the casserole (unbaked), wrap tightly, and freeze for up to 3 months. Thaw overnight in the fridge before baking.

Variations and Customizations

This casserole is incredibly adaptable. Here are some creative twists to suit different tastes and dietary needs:

Vegetarian Version: Replace turkey with sautéed mushrooms, lentils, or plant-based chicken substitutes. Use vegetable broth instead of chicken.
Gluten-Free: Use gluten-free flour for the roux and ensure stuffing and broth are certified GF. Substitute with quinoa or rice-based stuffing.
Dairy-Free: Swap butter for olive oil or dairy-free margarine, use coconut milk or almond milk instead of cream, and omit cheese or use vegan alternatives.
Spicy Kick: Add a dash of cayenne pepper, smoked paprika, or diced jalapeños to the sauce.
Herb-Forward: Use fresh herbs like thyme, parsley, and sage for brighter flavor.
Cheesy Layers: Add layers of Gruyère, fontina, or mozzarella between the filling and potatoes for gooey richness.
Breakfast Twist: Turn it into a brunch dish by adding fried eggs on top or mixing crumbled bacon into the filling.
Tex-Mex Style: Use cornbread stuffing, black beans, corn, chili powder, and top with tortilla strips and avocado.
Seafood Variation: Substitute turkey with flaked salmon or shrimp for a coastal twist.
Sweet Potato Topping: Replace mashed potatoes with mashed sweet potatoes for a sweeter, nutrient-rich alternative.

Health Considerations and Nutritional Value

While undeniably comforting, this casserole can be modified to fit various health goals:

Calories: A typical serving ranges from 350–500 calories depending on ingredients. Using less cream, butter, and cheese reduces fat and calorie content.
Protein: Turkey provides lean protein (about 25–30g per serving), supporting muscle repair and satiety.
Carbohydrates: Primarily from stuffing and potatoes. Opt for whole-grain stuffing and reduce portion size for lower glycemic impact.
Fats: Saturated fat comes from cream, butter, and cheese. Substituting with low-fat dairy or plant-based fats improves heart health.
Sodium: Leftover gravies and store-bought broths can be high in sodium. Use low-sodium broth and limit added salt.
Fiber: Adding more vegetables like broccoli, spinach, or kale boosts fiber and micronutrient content.
Vitamins & Minerals: Rich in B vitamins (from turkey), potassium (from potatoes), vitamin A (from carrots), and antioxidants from herbs.

To make a lighter version: use Greek yogurt instead of cream, increase vegetables, choose lean turkey breast, and bake with minimal cheese and butter. Portion control also plays a key role in balancing indulgence with nutrition.

Ingredients

3 cups cooked turkey, shredded or diced
2 cups leftover stuffing or dressing, broken into chunks
2–3 cups mashed potatoes (leftover preferred)
1 cup frozen peas and carrots
1 medium onion, finely chopped
2 cloves garlic, minced
7 tablespoons unsalted butter (divided)
1/3 cup all-purpose flour (or gluten-free alternative)
2 cups chicken or turkey broth (low-sodium optional)
1 cup heavy cream or half-and-half (or dairy-free alternative)
1 tablespoon Dijon mustard (optional)
1 teaspoon dried thyme
1/2 teaspoon rubbed sage
1/2 teaspoon dried rosemary
Salt and freshly ground black pepper, to taste
1/2 cup shredded cheddar cheese (optional)
1/4 cup panko breadcrumbs or crushed crackers (optional)

Directions

Preheat oven to 375°F (190°C). Grease a 9×13-inch casserole dish.
In a skillet, melt 3 tbsp butter over medium heat. Sauté onion and garlic until soft (3–4 min). Add peas and carrots; cook 5 min. Remove from heat.
In same pan, melt remaining 4 tbsp butter. Whisk in flour; cook 1–2 min. Slowly add broth, stirring constantly. Stir in cream, mustard, herbs, salt, and pepper. Simmer 5–7 min until thickened.
In a large bowl, mix turkey, stuffing, and vegetable mixture. Pour sauce over and stir until combined.
Spread half the mixture in baking dish. Layer with 1–2 cups mashed potatoes. Top with remaining turkey mixture.
Finish with remaining mashed potatoes, spreading evenly. Sprinkle cheese and breadcrumbs on top.
Bake 25–30 min until bubbly and golden. Broil 2–3 min for crisp top (optional).
Let rest 5–10 min before serving.

FAQ

Can I make this casserole ahead of time?
Yes! Assemble it up to 24 hours in advance, cover, and refrigerate. Add 5–10 minutes to baking time if starting cold.

Can I freeze Thanksgiving Leftover Turkey Casserole?
Absolutely. Bake first, cool completely, then wrap tightly and freeze for up to 3 months. Reheat in oven at 350°F until warmed through (about 30–40 min). Unbaked casseroles can also be frozen—add 10–15 minutes to baking time.

What can I use instead of mashed potatoes?
Try tater tots, crushed potato chips, puff pastry, or even a biscuit topping. Sweet potatoes or cauliflower mash are healthy alternatives.

My casserole is too dry. How can I fix it?
Add more broth or cream to the sauce next time. When reheating, sprinkle a little water or broth on top and cover with foil.

Can I add gravy to this casserole?
Yes! Stir in 1/2 to 1 cup of leftover gravy into the sauce for intensified flavor.

Is this recipe kid-friendly?
Definitely! Children love the creamy texture and familiar flavors. Customize with mild seasonings and extra cheese to win over picky eaters.

Can I use other meats?
Yes—chicken, ham, or even roast beef can replace turkey. Adjust seasonings accordingly.

Summary

The Thanksgiving Leftover Turkey Casserole is a delicious, comforting way to relive the magic of the holiday feast while minimizing waste. Packed with turkey, stuffing, mashed potatoes, and a creamy herb-infused sauce, it’s a family favorite that bakes to golden perfection.

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