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A golden-brown Leftover Chicken Shepherd's Pie in a white casserole dish, ready to be served.

Leftover Chicken Shepherd's Pie

This recipe transforms leftover roast chicken into a deeply comforting and rich meal. A creamy, savory chicken and vegetable filling is blanketed under a fluffy, golden-crusted potato topping, creating a culinary hug in a casserole dish.
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Prep Time 40 minutes
Cook Time 50 minutes
Total Time 1 hour 30 minutes
Servings: 6
Course: Main Course
Cuisine: American, British
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

  • 2 lbs Russet or Yukon Gold potatoes, peeled and quartered
  • 1/2 cup whole milk or heavy cream, warmed for topping
  • 4 tbsp unsalted butter, at room temperature for topping
  • 1/2 cup grated sharp cheddar or Parmesan cheese
  • 1 egg yolk optional
  • 2 tbsp olive oil or unsalted butter for filling
  • 1 large yellow onion, finely chopped
  • 2 carrots, peeled and diced
  • 2 celery stalks, diced
  • 2 cloves garlic, minced
  • 1/4 cup all-purpose flour
  • 2 cups low-sodium chicken broth
  • 1/2 cup whole milk or heavy cream for filling
  • 3-4 cups cooked chicken, shredded or cubed
  • 1 cup frozen peas
  • 1 tsp dried thyme or 1 tbsp fresh thyme leaves
  • 1 tbsp fresh parsley, chopped
  • Salt and freshly ground black pepper, to taste

Equipment

  • Large pot
  • Colander or strainer
  • Potato masher or ricer
  • Large skillet or Dutch oven
  • Whisk
  • Spatula or wooden spoon
  • 9x13 inch baking dish
  • Baking sheet
  • Knife and cutting board
  • Measuring cups and spoons

Method
 

  1. Prepare the Potato Topping: Place peeled and quartered potatoes in a large pot, cover with cold salted water, and bring to a boil. Cook for 15-20 minutes until tender. Drain well, return to the hot pot to steam off excess moisture. Add warmed milk, butter, salt, pepper, and optional egg yolk. Mash until smooth, then stir in the cheese. Set aside.
  2. Sauté the Vegetables: While potatoes boil, heat oil or butter in a large skillet over medium heat. Add onion, carrots, and celery and cook for 8-10 minutes until softened. Stir in minced garlic and thyme and cook for 1 more minute until fragrant.
  3. Build the Sauce: Sprinkle flour over the vegetables and stir constantly for one minute. Slowly whisk in the chicken broth, followed by the milk or cream. Bring to a simmer and cook for 3-5 minutes, stirring, until the sauce has thickened.
  4. Complete the Filling: Remove the skillet from the heat. Stir in the shredded chicken, frozen peas, and fresh parsley. Season generously with salt and pepper to taste.
  5. Assemble the Pie: Preheat oven to 400°F (200°C). Pour the hot chicken filling into a 9x13 inch baking dish. Carefully spoon the warm mashed potato topping over the filling, spreading it to cover completely. Use a fork to create peaks on the surface.
  6. Bake and Broil: Place the dish on a baking sheet. Bake for 20-25 minutes until the filling is bubbly. For a golden, crispy top, switch to the broiler for the final 2-3 minutes, watching carefully. Let the pie rest for at least 10 minutes before serving.

Notes

For the best results, use a potato masher or ricer, not a food processor, to avoid gummy potatoes. Use warm milk and room temperature butter for a smoother mash. Taste the filling before assembling and adjust seasoning, as the saltiness of leftover chicken and broth can vary. Variations: Try sweet potatoes for the topping, add mushrooms or corn to the filling, or substitute leftover turkey for the chicken.