Chicken Pot Pie Casserole

Ingredients

• 57 g (4 tablespoons)butter
• 1 smallonion, chopped
• 2 ribscelery, chopped
• 3 mediumcarrots, peeled and chopped
• 2 teaspoonsfresh thyme, chopped
• ¼ teaspoonpoultry seasoning
• ½ teaspoonkosher salt
• ¼ teaspoonfreshly ground black pepper
• 3 tablespoonsplain flour
• 475 ml (2 cups)low-sodium chicken stock
• 120 ml (½ cup)whole milk
• 1 largeYukon Gold potato, peeled and diced
• 3½ cupscooked chicken, shredded or diced
• ¾ cupfrozen baby peas
• 1 tube (8–10 biscuits)ready-to-bake biscuits
• 1 large, at room temperatureegg
• 1 tablespooncool water
• To tastefresh thyme or rosemary, chopped

Instructions

1. 1

   Soften the vegetables

   Melt the butter in a Dutch oven or heavy frying pan over medium heat. Add the onion, celery and carrots and cook until the onion and celery have softened.

2. 2

   Cook the seasonings

   Turn the heat to low and stir in the thyme, poultry seasoning, salt and pepper. Cook for 1 minute, stirring continuously. Sprinkle in the flour and cook for a further 2 minutes, stirring.

3. 3

   Simmer the filling

   Slowly whisk in the chicken stock and milk. Add the potato and bring the mixture to a gentle boil, then lower the heat and simmer until the potato and carrots are tender.

4. 4

   Prebake the biscuits

   Meanwhile, heat the oven to 175°C (350°F) and line a large baking tray with baking parchment. Separate the biscuits from the tube and arrange them a few inches apart on the tray.

5. 5

   Brush with egg wash

   Lightly beat the egg with the water. Brush the tops and sides of the biscuits with a thin layer of egg wash, then bake them for 8–9 minutes.

6. 6

   Add chicken and peas

   Stir the cooked chicken and peas into the Dutch oven with the creamy gravy and vegetables. Spoon the mixture into a 23 x 33 cm (9 x 13-inch) casserole dish, or one of a similar size.

7. 7

   Bake the casserole

   Arrange the prebaked biscuits on top of the chicken mixture with their browned sides facing down, then lightly brush the tops with egg wash. Bake at 175°C (350°F) for 10 minutes. Cover the dish with aluminium foil and bake for another 10 minutes.

What is chicken pot pie casserole?

Chicken pot pie is an American comfort-food dish built around chicken and vegetables in a savoury gravy, traditionally enclosed in pastry. This casserole keeps the filling but uses biscuits for a soft, flaky topping instead.

Here, the biscuits are briefly prebaked before they go on the filling. That gives them a head start and helps the topping finish baking while the casserole heats through.

Nutrition and macros by portion

The nutrition label shows one serving as written: 426 calories, 42g protein, 21g carbs, 19g fat.

The potato, carrots, peas and flour contribute most of the carbohydrates, while butter and whole milk provide much of the fat. Chicken is the main source of protein, with smaller contributions from the milk and biscuits. Pair a serving with a green salad or steamed vegetables to add a fresh, light side.

Build flavour with the vegetables

Aromatic base: cooking the onion, celery and carrots in butter softens them and lays the groundwork for the gravy. Let them become tender before adding the seasonings.

Seasonings: thyme, poultry seasoning, salt and pepper flavour the filling. Stir them in over low heat for a minute, then cook the flour for two minutes to make the base for the sauce.

Make a smooth gravy

Stock and milk: whisk them in gradually so the flour blends into the liquid without forming lumps. Bring the mixture to a gentle boil, then reduce the heat for the simmer.

Potato and carrots: simmer until both are tender before adding the chicken and peas. This is the main doneness cue for the vegetables; the exact time can vary with the size of the pieces.

Why prebake the biscuits?

The biscuits spend 8–9 minutes in the oven before they are placed on the filling. This partial bake gives them time to start browning and helps them hold their shape when transferred.

Once arranged browned-side down, their tops get a light coating of egg wash. Follow the final uncovered and covered baking stages in order so the biscuits can brown before the dish is covered.

Check the filling and topping

Vegetables: the potato and carrots should be tender after simmering in the gravy. Cut them into evenly sized pieces to help them cook at a similar pace.

Biscuits: the recipe gives a final bake of 10 minutes uncovered and 10 minutes covered. Check that the biscuits are baked through before serving, as biscuit size and oven performance can affect the finish.

Timing and serving

The filling simmers while the biscuits prebake, so those parts of the preparation can overlap. Have the casserole dish ready before you stir the chicken and peas into the gravy.

Serve the casserole hot, with a crisp green salad or a simple green vegetable alongside. A little chopped thyme or rosemary can be scattered over the top for a fresh herbal finish.

Recipe notes & tips

• Cut the potato and carrots into similar-sized pieces so they soften at a similar rate.
• Whisk the stock and milk in gradually to help keep the gravy smooth.
• Keep stirring as the flour cooks so it does not catch on the bottom of the pan.
• Leave a little space between the biscuits on the baking tray so they bake evenly.
• Use a light coating of egg wash on the biscuits rather than letting it pool around their edges.

Variations

• Fresh herbs: use thyme or rosemary as the finishing garnish, as suggested in the ingredients.
• Chicken pieces: choose shredded chicken for a more integrated filling or diced chicken for distinct chunks.
• Vegetable mix: add extra peas by replacing some of the carrots with the same amount of peas.
• Biscuit topping: arrange the biscuits close together for a more continuous layer over the filling.
• Individual servings: divide the filling among smaller oven-safe dishes and top each with biscuits.

Common mistakes to avoid

• Adding the liquid too quickly: whisk the stock and milk in gradually to help prevent lumps.
• Undercooked vegetables: simmer the potato and carrots until tender before adding the chicken and peas.
• Skipping the flour cooking time: stir it into the vegetables and cook for 2 minutes to make the gravy base.
• Crowding the baking tray: leave a couple of inches between biscuits so they can prebake evenly.
• Overdoing the egg wash: brush on a thin layer so it coats the biscuits without collecting around them.

How to store

Refrigerate leftovers in a covered container once cooled, and use within 3–4 days. Reheat in an oven-safe dish until hot throughout; cover if the biscuit topping is browning too quickly. The biscuit texture may soften after storage.

Frequently asked questions