Hot Chicken Salad Casserole: The Creamy, Herby Bake You’ll Make on Repeat

Some recipes have a way of bridging the gap between seasons perfectly, and this Hot Chicken Salad Casserole is one of them. Think of everything you love about a classic chicken salad: the creamy, tangy dressing, the satisfying crunch, the lightness of it. Now imagine all of that baked warm in a dish with a golden, crispy topping. That's exactly what this is, with a few touches that make it feel genuinely special rather than just a simple midweek bake.

This version has a Dijon mustard and white wine base that gives the whole thing a subtle depth you don't get from a standard creamy casserole. Fresh tarragon brings that classic French pairing with chicken, spring onions keep it feeling light and fresh, and the topping uses Kettle crisps in place of plain ones for a crunch that's a little more interesting. It's indulgent without being heavy, satisfying without being complicated, and it looks far more impressive than the effort involved would suggest.

On a cold weekday evening when you want something warming and homemade but don't have the energy for anything elaborate, this is the recipe you'll be glad you have saved.

Why You'll Love This Hot Chicken Salad Casserole

• It comes together in minutes. Mix, top, bake. The oven does all the heavy lifting and you're done in under 30 minutes.
• The flavour is a step above a standard chicken bake. The Dijon and white wine give the creamy base a gentle complexity that makes this feel properly homemade and thought-through.
• The texture is wonderful. Creamy and comforting underneath with a golden, crispy topping that gives you a satisfying crunch in every spoonful.
• It's a brilliant way to use leftover chicken. Roast chicken from the weekend, poached breast, or a supermarket rotisserie chicken all work beautifully here.
• Fresh tarragon makes it taste restaurant-quality. It's one of those herbs that most people don't use enough of at home, and it's absolutely wonderful with chicken.
• The whole family tends to love it. It's creamy, savoury, slightly cheesy, and has that crispy topping that makes everything better. Even fussy eaters usually find something to like here.

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What You'll Need: Ingredients for Hot Chicken Salad Casserole

Everything here is easy to find in a standard UK supermarket. A couple of small notes for UK readers below.

UK readers note: Kettle Chips are widely available at all major supermarkets. For this recipe, the Sea Salt and Balsamic Vinegar, Mature Cheddar and Chive, or Lightly Salted varieties all work brilliantly. Choose whichever flavour appeals most, though avoid anything heavily spiced as it can overpower the tarragon.

Fresh tarragon is usually found in the fresh herb section at Tesco, Waitrose, or M&S. If you can't find it, fresh chives work just as well and are easier to find year-round.

• 300g (2 cups) cooked chicken, roughly shredded or diced
• 100g (1 cup) celery, finely diced
• 3 to 4 spring onions, finely sliced
• 50g (½ cup) flaked or slivered almonds
• 1 tablespoon fresh tarragon leaves, roughly chopped (or 2 tablespoons fresh chives, snipped)
• ½ teaspoon fine sea salt
• ¼ teaspoon black pepper
• 2 tablespoons lemon juice
• 1 teaspoon Dijon mustard
• 2 tablespoons dry white wine (a Sauvignon Blanc or Pinot Grigio works well)
• 240g (1 cup) full-fat mayonnaise
• 60g (½ cup) mature cheddar, grated
• 50g Kettle Chips, lightly crushed

Full-fat mayonnaise gives the creamiest result. The Dijon and white wine balance the richness beautifully, so don't be tempted to use lighter mayo here. The flavour won't be the same.

Equipment You'll Need

Nothing specialist needed.

• Medium to large mixing bowl
• 20x30cm (roughly 8×12 inch) casserole or baking dish
• Grater for the cheese
• Sharp knife and chopping board

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How to Make Hot Chicken Salad Casserole

Step 1: Preheat the Oven and Prepare Your Dish

Heat your oven to 190°C fan / 210°C conventional (375°F). There's no need to grease the dish. Set it to one side while you pull together the filling.

Step 2: Mix the Filling

In a large bowl, combine the cooked chicken, diced celery, spring onions, almonds, and fresh tarragon. In a separate small bowl, whisk together the mayonnaise, Dijon mustard, white wine, lemon juice, salt, and pepper until smooth. Pour the dressing over the chicken mixture and stir everything together until well combined. Taste the filling at this stage and adjust the seasoning if needed. The Dijon should be present but not dominant, and the lemon juice should make the whole thing taste bright and fresh rather than flat.

Step 3: Transfer to the Dish

Tip the filling into your casserole dish and spread it out into an even layer. A fairly shallow baking dish gives you a better ratio of golden topping to creamy filling, which is exactly what you want.

Step 4: Add the Cheese and Kettle Crisp Topping

Scatter the grated cheddar evenly over the filling. Crush your Kettle Chips gently in the bag (you want a mix of small pieces and fine crumbs, not a completely fine powder) and scatter them in an even layer over the cheese. The Kettle Chips have more structural integrity than a standard crisp, which means they hold their crunch through the bake better. Don't crush them too finely or you'll lose that.

Step 5: Bake Until Golden

Place the dish in the centre of the oven and bake uncovered for 18 to 22 minutes until the filling is hot all the way through, the cheese has melted, and the topping is deeply golden and crisp. If the topping browns too quickly before the filling heats through, loosely cover with foil for the last few minutes.

Step 6: Serve Straight Away

This is best served immediately while the topping is at its crunchiest. Dish it up alongside a simple green salad or steamed greens and it's a proper, satisfying dinner on the table in well under 30 minutes.

Tips for the Best Hot Chicken Salad Casserole

Use chicken with flavour. Leftover roast chicken is ideal here because it already has depth from the seasoning and the roasting. A supermarket rotisserie chicken is your next best option. Plain poached chicken breast works too, but season the poaching water well with bay, peppercorns, and a little salt.

Don't rush the dressing. Whisking the mayonnaise, Dijon, white wine, and lemon juice together separately before adding to the chicken means it incorporates much more evenly. You get a consistent flavour in every spoonful rather than pockets of undressed chicken.

Toast the almonds first. A couple of minutes in a dry pan over a medium heat until they're lightly golden makes a noticeable difference to the flavour. Toasted almonds have a warmth and depth that raw ones don't, and it takes almost no time.

Add the Kettle Chips just before baking. If you're assembling this in advance, keep the topping separate until the dish goes in the oven. Kettle Chips are more robust than standard crisps, but they'll still lose their crunch if they sit on the filling for too long before baking.

Use the good wine. It only uses two tablespoons, so it's genuinely worth using a wine you'd actually drink rather than a cooking wine. The flavour comes through in the finished dish, particularly with the Dijon. A dry Sauvignon Blanc or Pinot Grigio is perfect.

A light scatter of extra fresh herbs to finish. A few extra snipped chives or tarragon leaves scattered over just before serving makes the dish look really beautiful and adds a final hit of freshness that lifts the whole thing.

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Make It Your Own

Swap the tarragon for chives. Fresh chives are easier to find year-round and work beautifully with the Dijon base. A combination of both is also lovely.

Add a little cream cheese to the base. A couple of tablespoons of soft cream cheese stirred through the dressing alongside the mayo gives extra body and a mild tanginess that works really well with the white wine.

Try Gruyere instead of cheddar. Gruyere melts beautifully and has a nuttier, slightly more complex flavour than cheddar. It pairs particularly well with the tarragon and Dijon, and makes this feel a little more special for entertaining.

Make it a bit lighter. Replace half the mayonnaise with full-fat Greek yoghurt for a slightly lighter result that still holds together well and tastes creamy. The white wine and Dijon do enough work that you won't miss the extra richness.

Add some spring greens or spinach. A couple of large handfuls of baby spinach stirred through the filling before baking wilts down to almost nothing but adds colour, a little iron, and makes the whole thing feel slightly more balanced.

Try different Kettle Chip flavours for the topping. The Mature Cheddar and Chive flavour is a particularly good match for the tarragon filling. Sea Salt and Balsamic Vinegar adds a lovely sharpness. Experiment once you've made the original version.

Frequently Asked Questions

How to Store and Reheat

In the fridge: Leftovers keep in an airtight container in the fridge for up to two days. The Kettle Chip topping will soften once refrigerated, but the flavour stays wonderful.

Reheating: Reheat individual portions in the microwave for 2 to 3 minutes until piping hot. To revive some crunch on the topping, transfer to a small ovenproof dish and pop under the grill on a medium heat for 3 to 4 minutes. A fresh scatter of crushed Kettle Chips on top before grilling works brilliantly.

Freezing: Not recommended due to the mayonnaise base.

Let's See Yours

This is one of those dinners that looks like you made far more effort than you did, and I mean that in the best possible way. If you make it, I'd love to see how it turns out. Share a photo on Instagram or come and find me on Facebook, especially on a Friday when I'm usually Live. For more easy, comforting midweek dinners, check out the recipe index.