Chicken And Broccoli Casserole
When the weeknight scramble hits and you need a hot meal on the table fast, this Chicken and Broccoli Casserole is the recipe I turn to every single time. It’s a one-dish wonder that cuts down on washing up, relies on store-cupboard staples, and comes together in under an hour with just a few minutes of hands-on prep.
Recipe Overview
- Prep time: 10 minutes
- Cook time: 30 minutes
- Total time: 40 minutes
- Servings: 4 generous portions
- Difficulty: Easy
Why You’ll Love This Chicken and Broccoli Casserole
- Ready in under 40 minutes from start to finish. No complicated techniques or lengthy simmering — just simple steps that get dinner on the table fast.
- Minimal washing up. You’ll only need a mixing bowl, a baking dish, and one pan for the chicken. Perfect for those evenings when the sink is already full.
- Make-ahead friendly. Assemble it the night before, keep it in the fridge, and bake it straight from cold when you get home.
- My kids absolutely devour this every time I make it. The creamy sauce and tender broccoli win over even the pickiest eaters, and I love that I’m sneaking in a portion of veg.
- Uses everyday ingredients you likely already have. No hunting for specialty items — just chicken, broccoli, cheese, and a few pantry basics.
Ingredients You’ll Need
- 500g boneless, skinless chicken breasts, cut into bite-sized chunks
- 1 tablespoon olive oil
- 1 medium onion, finely chopped
- 2 cloves garlic, minced
- 300ml chicken stock (from a cube is fine)
- 200ml double cream
- 1 teaspoon Dijon mustard
- 200g fresh broccoli florets (about 1 medium head)
- 150g grated mature cheddar cheese, divided
- 50g grated Parmesan cheese
- 2 tablespoons plain flour
- ½ teaspoon salt
- ¼ teaspoon black pepper
- 100g fresh breadcrumbs (optional, for topping)
Tip: For the quickest prep, buy pre-chopped broccoli florets from the supermarket. If you’re using frozen broccoli, thaw it first and pat it dry with kitchen paper to avoid watering down the sauce.
How to Make Chicken and Broccoli Casserole
- Preheat your oven to 190°C (fan 170°C). While it heats, lightly grease a 23x33cm baking dish with a little butter or oil — you’ll smell the warm metal as the oven comes up to temperature.
- Cook the chicken. Heat the olive oil in a large frying pan over medium-high heat. Add the chicken chunks in a single layer — you should hear a satisfying sizzle. Cook for 5-6 minutes, turning once, until the chicken is golden brown on the outside and no longer pink inside. The edges will look crisp and the pieces will feel firm to the touch. Transfer the chicken to a plate and set aside.
- Make the sauce base. In the same pan (don’t wipe it clean — those browned bits are flavour), add the chopped onion. Cook for 3-4 minutes until it turns translucent and smells sweet. Add the minced garlic and cook for another 30 seconds until fragrant. Sprinkle the flour over the onion mixture and stir constantly for 1 minute — the paste will turn a pale gold and smell slightly nutty.
- Build the creamy sauce. Slowly pour in the chicken stock while whisking continuously to prevent lumps. The mixture will thicken noticeably after about 2 minutes, turning from a thin liquid into a glossy sauce that coats the back of a spoon. Stir in the double cream, Dijon mustard, salt, and pepper. Let it simmer gently for 2 minutes — you’ll see small bubbles breaking the surface and the sauce will smell rich and savoury.
- Add the broccoli and cheese. Tip the broccoli florets into the sauce and stir well. Cook for 2 minutes until the broccoli turns bright green and starts to soften slightly. Remove the pan from the heat and stir in 100g of the grated cheddar and all the Parmesan. The cheese will melt into the sauce, creating a smooth, creamy mixture with a pale yellow colour.
- Combine and assemble. Return the cooked chicken to the pan and stir everything together until evenly coated. Pour the entire mixture into your prepared baking dish and spread it into an even layer. The sauce should look thick and glossy, with chunks of chicken and broccoli visible throughout.
- Top and bake. Sprinkle the remaining 50g of cheddar over the top, followed by the breadcrumbs if using. Bake for 18-20 minutes until the top is golden brown and bubbling around the edges — you’ll hear the sauce gently bubbling and the kitchen will fill with the smell of melted cheese. The breadcrumbs should look crisp and toasted.
- Rest before serving. Remove the dish from the oven and let it stand for 5 minutes. This allows the sauce to set slightly so it doesn’t run all over the plate. The surface will still be hot but the casserole will hold its shape when spooned out.
Tips From My Kitchen
- Pre-cook the broccoli just until tender, not mushy. The broccoli continues to cook in the oven, so if you boil it until soft beforehand, you’ll end up with sad, watery florets. A 2-minute simmer in the sauce is plenty — the florets should still have a slight bite when you assemble the dish.
- Use full-fat dairy for the creamiest results. Double cream and full-fat cheddar give the sauce its luxurious texture. Low-fat alternatives tend to split or become grainy when baked, and nobody wants a separated sauce on their dinner plate.
- Make it ahead for busy evenings. Assemble the casserole completely (without the breadcrumb topping) up to 24 hours in advance. Cover the dish with foil and keep it in the fridge. When you’re ready to bake, add the breadcrumbs and bake for 25-30 minutes from cold, or until bubbling through the centre.
- Freeze individual portions for emergency dinners. This casserole freezes beautifully. Portion it into individual oven-safe containers, cool completely, then freeze for up to 3 months. To reheat, bake from frozen at 180°C for 30-35 minutes until piping hot throughout.
- Get the breadcrumbs extra crispy. Toss the fresh breadcrumbs with a tablespoon of melted butter before sprinkling them over the top. This creates a golden, crunchy crust that contrasts perfectly with the creamy sauce underneath.
Common Mistakes to Avoid
- Overcrowding the pan when cooking the chicken: If you pile the chicken chunks into the pan all at once, they’ll steam instead of brown. The result is pale, rubbery chicken with no flavour. Cook in a single layer with space between each piece, and work in batches if needed. The sizzling sound tells you the pan is hot enough.
- Wrong temperature for baking: Baking at too high a temperature will scorch the cheese topping before the centre is hot through. Too low, and the sauce will turn watery and the chicken will dry out. Stick to 190°C (fan 170°C) — it’s the sweet spot for a golden top and a perfectly cooked interior.
- Skipping the rest time after baking: It’s tempting to dig in straight away, but the casserole needs those 5 minutes to set. Without resting, the sauce will be runny and the layers won’t hold together. The dish will be piping hot anyway, so use that time to set the table or pour the drinks.
What to Serve With Chicken and Broccoli Casserole
- Steamed rice — plain white or brown rice soaks up the extra sauce beautifully.
- Crusty bread — a warm baguette or sourdough is perfect for mopping up every last bit of creamy sauce.
- A simple green salad — a handful of mixed leaves with a lemony vinaigrette cuts through the richness of the casserole.
- Roasted new potatoes — toss them in olive oil and salt, then roast at 200°C while the casserole bakes for an easy side.
Still hungry for ideas? You might also love Chicken Broccoli Rice Cheese Casserole Recipe, Hearty Chicken Cobbler Casserole Recipe from our sister kitchens.
Frequently Asked Questions
Can I use leftover cooked chicken?
Absolutely. If you have leftover roast chicken or cooked chicken from earlier in the week, shred or chop it and add it to the sauce in step 5. Skip the initial cooking step and reduce the total bake time by 5 minutes since the chicken is already cooked through.
How do I make this casserole gluten-free?
Substitute the plain flour with cornflour (cornstarch) mixed with a little cold water to form a slurry. Use 1 tablespoon of cornflour dissolved in 2 tablespoons of water, then whisk it into the stock before adding the cream. Also use gluten-free breadcrumbs for the topping, or skip them entirely.
Can I add other vegetables to this casserole?
Yes, this recipe is very adaptable. Try adding a handful of frozen peas, sliced mushrooms, or diced red bell pepper along with the broccoli. Just keep the total vegetable volume roughly the same so the sauce-to-veg ratio stays balanced. Mushrooms should be sautéed first to release their moisture.
Why did my sauce turn out grainy?
A grainy sauce usually means the dairy was overheated or the cheese was added too quickly. Always remove the pan from the heat before stirring in the cheese, and add it in handfuls rather than all at once. Using full-fat cream and cheese also helps prevent graininess, as lower-fat options are more prone to splitting.
How long will leftovers keep in the fridge?
Covered tightly with foil or in an airtight container, this casserole will keep for up to 4 days in the fridge. Reheat individual portions in the microwave for 2-3 minutes, or warm the whole dish in the oven at 160°C for 15-20 minutes until piping hot. The flavours actually deepen overnight, making leftovers even better.
Chicken and Broccoli Casserole
A creamy, cheesy casserole with tender chicken, bright broccoli, and a golden breadcrumb topping. Comfort food at its finest, perfect for a weeknight dinner.
Ingredients
Method
- Preheat your oven to 190°C (fan 170°C). While it heats, lightly grease a 23x33cm baking dish with a little butter or oil — you’ll smell the warm metal as the oven comes up to temperature.
- Cook the chicken. Heat the olive oil in a large frying pan over medium-high heat. Add the chicken chunks in a single layer — you should hear a satisfying sizzle. Cook for 5-6 minutes, turning once, until the chicken is golden brown on the outside and no longer pink inside. The edges will look crisp and the pieces will feel firm to the touch. Transfer the chicken to a plate and set aside.
- Make the sauce base. In the same pan (don’t wipe it clean — those browned bits are flavour), add the chopped onion. Cook for 3-4 minutes until it turns translucent and smells sweet. Add the minced garlic and cook for another 30 seconds until fragrant. Sprinkle the flour over the onion mixture and stir constantly for 1 minute — the paste will turn a pale gold and smell slightly nutty.
- Build the creamy sauce. Slowly pour in the chicken stock while whisking continuously to prevent lumps. The mixture will thicken noticeably after about 2 minutes, turning from a thin liquid into a glossy sauce that coats the back of a spoon. Stir in the double cream, Dijon mustard, salt, and pepper. Let it simmer gently for 2 minutes — you’ll see small bubbles breaking the surface and the sauce will smell rich and savoury.
- Add the broccoli and cheese. Tip the broccoli florets into the sauce and stir well. Cook for 2 minutes until the broccoli turns bright green and starts to soften slightly. Remove the pan from the heat and stir in 100g of the grated cheddar and all the Parmesan. The cheese will melt into the sauce, creating a smooth, creamy mixture with a pale yellow colour.
- Combine and assemble. Return the cooked chicken to the pan and stir everything together until evenly coated. Pour the entire mixture into your prepared baking dish and spread it into an even layer. The sauce should look thick and glossy, with chunks of chicken and broccoli visible throughout.
- Top and bake. Sprinkle the remaining 50g of cheddar over the top, followed by the breadcrumbs if using. Bake for 18-20 minutes until the top is golden brown and bubbling around the edges — you’ll hear the sauce gently bubbling and the kitchen will fill with the smell of melted cheese. The breadcrumbs should look crisp and toasted.
- Rest before serving. Remove the dish from the oven and let it stand for 5 minutes. This allows the sauce to set slightly so it doesn’t run all over the plate. The surface will still be hot but the casserole will hold its shape when spooned out.
Notes
For a lower-carb version, omit the breadcrumbs. You can substitute double cream with half-and-half for a lighter sauce, but the texture will be less rich.
This is my go-to recipe when I need something quick but impressive, and I hope it becomes a staple in your weeknight rotation too. If you give it a try, I’d love to hear how it turned out for you — drop a comment below and let me know if your family loved it as much as mine does. For another speedy dinner idea, you might also enjoy this Shrimp Pasta Recipe Simple And Quick Seafood, or if you’re after something hearty, the Stuffed Bell Peppers With Turkey Recipe Healthy is a brilliant make-ahead option. Happy cooking!
