There’s something deeply satisfying about pulling a bubbling, golden-brown casserole from the oven. The aroma alone is enough to bring everyone to the table, and this Cheesy Chicken Casserole is the queen of them all in my household. It’s a wonderfully comforting dinner bake that combines tender chunks of chicken, perfectly cooked pasta, and a rich, velvety cheese sauce that clings to every single piece. Friends always ask me for this recipe after trying it at dinner parties, and I’m so happy to be sharing it with you today.

What makes this particular chicken casserole so special is the sauce. We’re not using any condensed soups here; we’re making a proper, luscious cheese sauce from scratch. It’s a straightforward process, but it elevates the entire dish from a simple bake to something truly memorable. The combination of mature Cheddar for a sharp, tangy flavour and a little mozzarella for that glorious, stringy cheese pull is simply divine. This is the kind of family meal that feels like a warm hug on a plate, ideal for those chilly evenings when you need a bit of culinary comfort.

Recipe Overview

This Cheesy Chicken Casserole recipe delivers a beautifully balanced dish with tender chicken, al dente pasta, and an exceptionally creamy sauce. The flavour is rich and savoury, with a sharp cheesy tang and a hint of warmth from mustard powder and paprika. After testing this many times, I’ve found that using a combination of whole milk and single cream gives the sauce the most luxurious texture without it being too heavy.

• Prep Time: 20 minutes
• Cook Time: 25 minutes
• Total Time: 45 minutes
• Servings: 6 people
• Difficulty: Easy

Why You’ll Love This Cheesy Chicken Casserole

• Genuine Flavour: The homemade cheese sauce, made with a proper roux, provides a deep, authentic flavour that you just don’t get from a jar. The sharpness of a good mature Cheddar really shines through.
• Ready in Under an Hour: From start to finish, this comforting dinner bake is on the table in about 45 minutes, which works beautifully for a busy weeknight.
• Flexible Recipe: You can easily adapt this cheesy casserole. Stir in some steamed broccoli florets, sweetcorn, or sautéed leeks with the chicken. Don’t have penne? Fusilli or macaroni work just as well.
• Great for a Family Meal: This recipe serves six generously, making it a brilliant choice for feeding the family or having friends over for a relaxed supper.
• Family Tested: My children adore this dish, especially the crispy, cheesy topping. It’s one of the few meals that guarantees clean plates all around our table.

Cheesy Chicken Casserole

⏱️ 15 min prep  •  🍳 60 min cook  •  👥 6 servings

📌 Pin This Recipe

Ingredients You’ll Need

For the best results, I recommend using good-quality ingredients, especially the cheese. A block of mature Cheddar that you grate yourself will melt much better and have a more pronounced flavour than pre-grated varieties, which often contain anti-caking agents. I often use Cathedral City Extra Mature Cheddar for its reliable sharpness.

• 600g boneless, skinless chicken breasts, cut into 2-3cm cubes
• 300g dried penne pasta
• 1 tbsp olive oil
• 1 medium onion, finely chopped
• 2 cloves garlic, minced
• 200g chestnut mushrooms, sliced
• For the Cheese Sauce:
• 60g unsalted butter
• 60g plain flour
• 700ml whole milk
• 150ml single cream
• 1 tsp Dijon mustard
• 1/2 tsp smoked paprika
• 250g mature Cheddar cheese, grated
• 100g mozzarella cheese, grated
• Salt and freshly ground black pepper, to taste
• For the Topping:
• 50g fresh breadcrumbs (panko works well too)
• 30g extra mature Cheddar cheese, grated
• 1 tbsp fresh parsley, finely chopped

Elena’s Tip: Don’t be tempted to use low-fat milk for the sauce. The fat content in whole milk is essential for creating a stable, creamy, and rich sauce that won’t split.

How to Make Cheesy Chicken Casserole

The process for this chicken casserole is straightforward. We cook the pasta, prepare the chicken and vegetables, make the glorious cheese sauce, and then combine everything for the final bake. Let’s get started.

1. Preheat and Cook Pasta: First, preheat your oven to 180°C (160°C fan). Bring a large pot of salted water to a boil and cook the penne according to the package instructions, but undercook it by about 2 minutes so it’s very al dente. It will finish cooking in the oven. Drain and set aside.
2. Sauté the Aromatics: While the pasta cooks, heat the olive oil in a large, deep frying pan or Dutch oven over a medium heat. Add the chopped onion and cook for 5-7 minutes, until softened and translucent. Add the minced garlic and sliced mushrooms and cook for another 5 minutes, until the mushrooms have released their water and started to brown.
3. Cook the Chicken: Add the cubed chicken to the pan. Season generously with salt and pepper. Cook for 6-8 minutes, stirring occasionally, until the chicken is cooked through and lightly golden. Remove the chicken and mushroom mixture from the pan and set it aside.
4. Make the Roux: In the same pan, melt the butter over a medium heat. Once melted, whisk in the plain flour and cook for 1-2 minutes, stirring constantly. This is called a roux and it will thicken our sauce. This step is crucial for a smooth sauce, and you can learn more about the science behind a perfect roux here.
5. Create the Creamy Sauce: Gradually pour in the milk, whisking continuously to prevent lumps. I find it’s best to add the first 200ml or so very slowly, whisking until smooth before adding the rest. Continue to cook, stirring frequently, for about 5-7 minutes until the sauce thickens enough to coat the back of a spoon.
6. Add the Cheese: Remove the pan from the heat. Stir in the single cream, Dijon mustard, and smoked paprika. Then, add the 250g of grated Cheddar and 100g of mozzarella. Stir until the cheese is completely melted and the sauce is velvety and smooth. Season with salt and pepper to your taste.
7. Combine and Assemble: Return the cooked chicken and mushroom mixture to the pan with the cheese sauce. Add the drained pasta and stir everything together until well combined and every piece of pasta and chicken is coated in the sauce.
8. Bake to Perfection: Pour the mixture into a 9×13 inch (or similar capacity) baking dish and spread it out evenly. In a small bowl, mix the breadcrumbs, the extra 30g of Cheddar, and the chopped parsley. Sprinkle this topping evenly over the casserole.
9. Final Bake: Bake in the preheated oven for 20-25 minutes, until the topping is golden brown and the sauce is bubbling deliciously around the edges. Let it rest for 5 minutes before serving.

Tips From My Kitchen

• Temperature Control: When making the cheese sauce, make sure your milk isn’t fridge-cold. Using room temperature or slightly warmed milk helps it incorporate into the roux more smoothly and reduces the chance of lumps.
• The Secret Step: I learned that taking the sauce off the heat *before* adding the cheese is key. If the sauce is too hot, the cheese can become grainy or separate. This small step ensures a perfectly silky finish every time.
• Make-Ahead: You can assemble the entire casserole (without the breadcrumb topping) up to a day in advance. Cover it tightly and store it in the fridge. When you’re ready to bake, add the topping and increase the baking time by 10-15 minutes.
• Storage: Leftovers are fantastic! Store any remaining casserole in an airtight container in the fridge for up to 3 days. Reheat in the microwave or in the oven at 160°C until piping hot.

Equipment You’ll Need

• 9×13 inch (or 23×33 cm) baking dish
• Large saucepan for pasta
• Large, deep frying pan or Dutch oven
• Whisk
• Mixing bowls
• Sharp knife and chopping board

Common Mistakes to Avoid

• Overcooking the Pasta: A common pitfall is fully cooking the pasta before it goes into the oven. It will continue to cook in the hot sauce, so pulling it from the water when it’s still quite firm (al dente) is essential to avoid a mushy final dish.
• A Lumpy Sauce: This usually happens when the milk is added too quickly to the hot roux. Add the milk gradually at the beginning, whisking vigorously until each addition is fully incorporated before adding more.
• Skipping the Rest Time: It’s tempting to dive right in, but letting the casserole rest for 5-10 minutes after it comes out of the oven allows the sauce to set up slightly. This makes it easier to serve and helps the flavours meld together.

Delicious Variations to Try

One of the best things about a dinner bake like this is how easily you can adapt it. Here are a few ideas we enjoy in our home:

• A Bit of Spice: Add 1/2 teaspoon of chilli flakes or a finely chopped red chilli along with the garlic for a gentle, warming heat that cuts through the richness of the cheese.
• Add More Veg: This is a great recipe for using up vegetables. Try adding a large handful of fresh spinach to the sauce at the end (it will wilt down), or some lightly steamed broccoli or peas for extra colour and nutrition.
• Different Protein: Leftover cooked chicken from a Sunday roast works brilliantly here. You can also make this with cubed turkey breast or even use a flavourful sausage, like chorizo. For a different twist, try my Savory Garlic Butter Shrimp For Dinner, though you’d add the cooked shrimp at the very end to avoid overcooking.

What to Serve With Cheesy Chicken Casserole

This cheesy casserole is a hearty meal on its own, but a simple side dish can complete the plate beautifully.

• A Crisp Green Salad: A simple salad with a sharp vinaigrette dressing provides a fresh, acidic contrast that cuts through the richness of the cheese sauce.
• Garlic Bread: An absolute classic pairing. Perfect for mopping up every last bit of that delicious sauce from your plate.
• Steamed Green Vegetables: A side of steamed green beans, asparagus, or tenderstem broccoli adds a lovely bit of texture and freshness.
• Wine Pairing: A crisp, unoaked Chardonnay or a dry Sauvignon Blanc complements the creamy sauce without overpowering it.

Frequently Asked Questions

Cheesy Chicken Casserole

A rich and creamy baked pasta dish with tender chicken and mushrooms, all smothered in a homemade three-cheese sauce and topped with a crispy, golden breadcrumb crust.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 15 minutes mins

Servings: 6 servings

Course: Main Course

Cuisine: American

Calories: 885

Ingredients Method Notes

Ingredients

  

• 600 g boneless skinless chicken breasts, cut into 2-3cm cubes
• 300 g dried penne pasta
• 1 tbsp olive oil
• 1 medium onion finely chopped
• 2 cloves garlic minced
• 200 g chestnut mushrooms sliced

For the Cheese Sauce

• 60 g unsalted butter
• 60 g plain flour
• 700 ml whole milk
• 150 ml single cream
• 1 tsp Dijon mustard
• 1/2 tsp smoked paprika
• 250 g mature Cheddar cheese grated
• 100 g mozzarella cheese grated
• Salt and freshly ground black pepper to taste

For the Topping

• 50 g fresh breadcrumbs panko works well too
• 30 g extra mature Cheddar cheese grated
• 1 tbsp fresh parsley finely chopped

Method

 

1. Preheat and Cook Pasta: First, preheat your oven to 180°C (160°C fan). Bring a large pot of salted water to a boil and cook the penne according to the package instructions, but undercook it by about 2 minutes so it’s very al dente. It will finish cooking in the oven. Drain and set aside.
2. Sauté the Aromatics: While the pasta cooks, heat the olive oil in a large, deep frying pan or Dutch oven over a medium heat. Add the chopped onion and cook for 5-7 minutes, until softened and translucent. Add the minced garlic and sliced mushrooms and cook for another 5 minutes, until the mushrooms have released their water and started to brown.
3. Cook the Chicken: Add the cubed chicken to the pan. Season generously with salt and pepper. Cook for 6-8 minutes, stirring occasionally, until the chicken is cooked through and lightly golden. Remove the chicken and mushroom mixture from the pan and set it aside.
4. Make the Roux: In the same pan, melt the butter over a medium heat. Once melted, whisk in the plain flour and cook for 1-2 minutes, stirring constantly. This is called a roux and it will thicken our sauce. This step is crucial for a smooth sauce, and you can learn more about the science behind a perfect roux here.
5. Create the Creamy Sauce: Gradually pour in the milk, whisking continuously to prevent lumps. I find it's best to add the first 200ml or so very slowly, whisking until smooth before adding the rest. Continue to cook, stirring frequently, for about 5-7 minutes until the sauce thickens enough to coat the back of a spoon.
6. Add the Cheese: Remove the pan from the heat. Stir in the single cream, Dijon mustard, and smoked paprika. Then, add the 250g of grated Cheddar and 100g of mozzarella. Stir until the cheese is completely melted and the sauce is velvety and smooth. Season with salt and pepper to your taste.
7. Combine and Assemble: Return the cooked chicken and mushroom mixture to the pan with the cheese sauce. Add the drained pasta and stir everything together until well combined and every piece of pasta and chicken is coated in the sauce.
8. Bake to Perfection: Pour the mixture into a 9x13 inch (or similar capacity) baking dish and spread it out evenly. In a small bowl, mix the breadcrumbs, the extra 30g of Cheddar, and the chopped parsley. Sprinkle this topping evenly over the casserole.
9. Final Bake: Bake in the preheated oven for 20-25 minutes, until the topping is golden brown and the sauce is bubbling deliciously around the edges. Let it rest for 5 minutes before serving.

Notes

Let the casserole rest for 5-10 minutes before serving to allow the sauce to set slightly. It pairs wonderfully with a simple green salad or steamed broccoli.

I hope you and your family enjoy this Cheesy Chicken Casserole as much as we do. It’s a truly comforting, satisfying meal that always gets compliments. I would love to hear how you get on with it, so please feel free to leave a comment below and let me know if you tried any delicious variations!

Happy cooking,
Elena Rodriguez