This Roasted Chicken and Broccoli Casserole is the ultimate comfort food for busy weeknights. Tender chicken and crisp broccoli roast together before being smothered in a creamy, cheesy sauce. It’s a simple, one-pan wonder that delivers maximum flavor with minimal cleanup.
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Why You’ll Love This Roasted Chicken and Broccoli Casserole
- Ultimate comfort food: Cozy, satisfying bites with tender chicken and a rich, creamy sauce.
- Incredibly versatile: Easily adapt with different cheeses, veggies, or proteins.
- Perfect for meal prep: Reheats beautifully, with flavors improving over time.
- Minimal cleanup: Roast and mix in one dish for easy cleanup.
Ingredients & Tools
- 500 g boneless, skinless chicken breasts or thighs, cut into 1-inch cubes
- 1 large head of broccoli, cut into florets (about 400-500 g)
- 1 medium yellow onion, diced
- 3 cloves garlic, minced
- 200 ml heavy cream (double cream)
- 120 g shredded cheddar cheese, divided
- 60 g grated Parmesan cheese
- 2 tbsp olive oil or avocado oil
- 1 tsp smoked paprika
- 1/2 tsp garlic powder
- 1/2 tsp onion powder
- Salt and black pepper to taste
- Fresh parsley or chives for garnish (optional)
Tools: A 9×13 inch (or similar) baking dish, a large mixing bowl, and a small bowl for mixing the sauce.
Notes: Grating your own cheddar from a block (vs. pre-shredded) gives a smoother melt. Don’t skimp on seasonings for maximum flavor.
Nutrition (per serving)
| Calories: | 485 kcal |
| Protein: | 35 g |
| Fat: | 35 g |
| Carbs: | 9 g |
| Fiber: | 3 g |
Serves: 4 | Prep Time: 15 minutes | Cook Time: 30 minutes | Total Time: 45 minutes
Before You Start: Tips & Ingredient Notes
- Cut everything to a similar size. This ensures the chicken and broccoli cook evenly. You don’t want tiny, overcooked broccoli bits next to giant, undercooked chunks of chicken.
- Don’t skip the pre-roast. Giving the chicken and broccoli a quick roast before adding the sauce does two things: it kick-starts the cooking and, more importantly, adds a lovely depth of flavor through caramelization.
- Freshly grate your cheese if you can. Pre-shredded cheese is coated with anti-caking agents like potato starch, which can prevent your sauce from getting as silky and smooth as it could be.
- Taste your sauce base. Before you pour it over the roasted ingredients, give the cream and seasoning mixture a quick taste. This is your chance to adjust the salt, pepper, or paprika to your liking.
How to Make Roasted Chicken and Broccoli Casserole
Step 1: Preheat your oven to 200°C (400°F). This is a fairly hot oven, and that’s intentional—we want to get some good color and roasty flavor on our main ingredients. While it’s heating, grab your baking dish and add the cubed chicken and broccoli florets. Drizzle everything with the olive oil and toss it all together with your hands until everything is lightly and evenly coated. You’ll notice the oil helps the seasonings stick and promotes even browning.
Step 2: Now, it’s time for the dry seasonings. Sprinkle the smoked paprika, garlic powder, onion powder, and a generous amount of salt and black pepper over the chicken and broccoli. Toss everything again, making sure those lovely spices are distributed throughout. The smoked paprika is key here—it gives a subtle, smoky backbone that really elevates the whole dish.
Step 3: Spread the chicken and broccoli out into a single, even layer in your baking dish. This is important for proper roasting; if things are piled on top of each other, they’ll steam instead of roast. Pop the dish into your preheated oven and roast for about 15 minutes. You’re looking for the chicken to be mostly cooked through and the broccoli to have brightened in color with some slightly crispy, browned edges.
Step 4: While that’s in the oven, let’s make the super simple sauce. In a medium bowl, combine the heavy cream, about two-thirds of the shredded cheddar (save the rest for the top!), all of the Parmesan, the minced garlic, and the diced onion. Give it a good whisk until everything is well incorporated. The sauce will look a little thin, but don’t worry—it will thicken up beautifully in the oven.
Step 5: Carefully remove the baking dish from the oven. The chicken and broccoli should be smelling amazing. Pour the creamy cheese sauce evenly over the top of the roasted ingredients. Use a spoon or spatula to gently stir and combine everything, ensuring the sauce gets down into all the nooks and crannies.
Step 6: Sprinkle the remaining cheddar cheese over the entire surface of the casserole. This is what will create that gorgeous, golden-brown, bubbly crust we all love. Return the dish to the oven and bake for another 12-15 minutes, or until the sauce is bubbling actively around the edges and the top is beautifully spotted with brown.
Step 7: For the final touch, turn your oven to the grill (broil) setting for the last 1-2 minutes. Keep a very close eye on it! This will give the cheese topping an extra boost of color and crispiness. Once it’s perfectly golden, remove it from the oven and let it rest for about 5 minutes before serving. This rest time allows the sauce to thicken up just a bit more. Garnish with some fresh chopped parsley or chives if you like.
Storage & Freshness Guide
- Fridge: Store leftovers in an airtight container for 3–4 days.
- Freezer: Not recommended; sauce may separate and broccoli can turn watery.
- Reviving: Reheat in a 180°C (350°F) oven until hot to restore crisp topping.
Serving Suggestions
Complementary Dishes
- A simple green salad with a sharp vinaigrette — The acidity and freshness cut through the richness of the casserole perfectly, creating a wonderfully balanced plate.
- Cauliflower rice or mash — It soaks up the extra creamy sauce beautifully and keeps the meal light and low-carb, making for a truly satisfying combination.
- Sautéed garlic mushrooms — Adding an extra layer of earthy, umami flavor that complements the chicken and cheese in the most delightful way.
Drinks
- A crisp, dry white wine like Sauvignon Blanc — Its bright citrus notes provide a refreshing contrast to the creamy, savory elements of the casserole.
- Sparkling water with a squeeze of lemon — The bubbles and citrus cleanse the palate between bites, ensuring each mouthful tastes as fantastic as the first.
- A light-bodied pale ale — The slight bitterness and carbonation stand up well to the cheese and fat, making for a very classic and comforting pairing.
Something Sweet
- A few fresh berries with whipped cream — The natural sweetness and slight tartness are a simple, elegant, and refreshing way to end the meal without feeling too heavy.
- A square of very dark chocolate (85% or higher) — It’s rich and satisfying without being overly sweet, providing a sophisticated finish that complements the savory dinner.
- A small portion of lemon sorbet — The intense, clean citrus flavor is like a reset for your palate after the rich and cheesy main course.
Top Mistakes to Avoid
- Overcrowding the baking dish. If you pack everything in too tightly, the ingredients will steam instead of roast. You’ll miss out on that delicious caramelized flavor and the broccoli can become mushy. A single layer is key.
- Using frozen broccoli without thawing and drying it first. Frozen broccoli releases a ton of water as it cooks, which will make your casserole soupy and dilute the creamy sauce. If you must use frozen, thaw it completely and pat it very dry with paper towels.
- Skipping the rest time after baking. I know it’s tempting to dig right in, but letting the casserole sit for 5-10 minutes allows the sauce to set slightly. This means it will hold its shape on the plate instead of running everywhere.
- Underseasoning the initial roast. The chicken and broccoli need a good amount of salt and pepper before they go into the oven. This builds layers of flavor from the inside out, so the final dish isn’t bland.
Expert Tips
- Tip: For an extra flavor boost, try marinating your cubed chicken in the oil and spices for 30 minutes in the fridge before you start assembling. This allows the seasonings to really penetrate the meat, resulting in a more deeply flavored chicken throughout.
- Tip: If you notice the top of your casserole is browning too quickly during the final bake, simply lay a loose piece of aluminium foil over the top. This will shield the cheese from direct heat and prevent burning while the inside continues to cook.
- Tip: For a bit of texture contrast, mix in some cooked, crumbled bacon or diced ham with the sauce. It adds a salty, smoky punch and a different mouthfeel that makes the casserole even more interesting.
- Tip: If you want a thicker sauce, you can whisk a tablespoon of cream cheese into the heavy cream mixture. It adds a lovely tang and helps the sauce cling to the chicken and broccoli even better.
FAQs
Can I make this casserole ahead of time?
Absolutely, it’s a fantastic make-ahead meal. You have two great options. You can assemble the entire casserole, cover it tightly, and refrigerate it for up to 24 hours before baking. Just add an extra 5-10 minutes to the baking time since it will be going into the oven cold. Alternatively, you can bake it completely, let it cool, and then reindividual portions as needed. It reheats wonderfully in the microwave or a 180°C (350°F) oven until warmed through.
Can I use chicken thighs instead of breasts?
You absolutely can, and many people prefer them! Chicken thighs are more forgiving and tend to stay juicier during the roasting process. Just make sure to cut them into similarly sized pieces as you would with breasts. The cooking time should remain about the same, but always check that the internal temperature of the chicken has reached 74°C (165°F) to ensure it’s fully cooked.
My sauce turned out a bit watery. What happened?
This usually happens for one of two reasons. The most common culprit is moisture from the vegetables, especially if you used frozen broccoli that wasn’t thoroughly dried. The other possibility is that the casserole needed a few more minutes in the oven for the sauce to reduce and thicken properly. Next time, ensure your veggies are dry and let the casserole bubble away until the sauce visibly clings to the ingredients.
Is it possible to make this dairy-free?
It is, with a few clever swaps. For the cream, you can use a full-fat, unsweetened canned coconut milk. For the cheeses, there are some surprisingly good dairy-free cheddar and Parmesan shreds on the market now. Just be sure to read the labels, as some melt better than others. The flavor profile will be different, but it can still be a very delicious and comforting dish.
How long do leftovers last, and how should I store them?
Leftovers will keep beautifully in an airtight container in the refrigerator for 3-4 days. To reheat, I recommend using an oven or toaster oven at around 180°C (350°F) until hot. This will help the topping crisp up again. The microwave works in a pinch, but it can make the topping a bit soft. I do not recommend freezing this casserole, as the creamy sauce can separate and the broccoli can become very watery upon thawing.
Roasted Chicken And Broccoli Casserole
Make this easy Roasted Chicken and Broccoli Casserole for a creamy, cheesy weeknight dinner. One-pan recipe with minimal cleanup. Get the full recipe here!
Ingredients
For the Ingredients
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500 g boneless, skinless chicken breasts or thighs (cut into 1-inch cubes)
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1 large head broccoli (cut into florets (about 400-500 g))
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1 medium yellow onion (diced)
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3 cloves garlic (minced)
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200 ml heavy cream (double cream)
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120 g shredded cheddar cheese (divided)
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60 g grated Parmesan cheese
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2 tbsp olive oil or avocado oil
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1 tsp smoked paprika
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0.5 tsp garlic powder
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0.5 tsp onion powder
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Salt and black pepper (to taste)
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Fresh parsley or chives (for garnish (optional))
Instructions
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Preheat your oven to 200°C (400°F). Grab your baking dish and add the cubed chicken and broccoli florets. Drizzle everything with the olive oil and toss it all together with your hands until everything is lightly and evenly coated.01
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Sprinkle the smoked paprika, garlic powder, onion powder, and a generous amount of salt and black pepper over the chicken and broccoli. Toss everything again, making sure those lovely spices are distributed throughout.02
-
Spread the chicken and broccoli out into a single, even layer in your baking dish. Pop the dish into your preheated oven and roast for about 15 minutes. You’re looking for the chicken to be mostly cooked through and the broccoli to have brightened in color with some slightly crispy, browned edges.03
-
While that’s in the oven, let’s make the super simple sauce. In a medium bowl, combine the heavy cream, about two-thirds of the shredded cheddar (save the rest for the top!), all of the Parmesan, the minced garlic, and the diced onion. Give it a good whisk until everything is well incorporated.04
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Carefully remove the baking dish from the oven. Pour the creamy cheese sauce evenly over the top of the roasted ingredients. Use a spoon or spatula to gently stir and combine everything, ensuring the sauce gets down into all the nooks and crannies.05
-
Sprinkle the remaining cheddar cheese over the entire surface of the casserole. Return the dish to the oven and bake for another 12-15 minutes, or until the sauce is bubbling actively around the edges and the top is beautifully spotted with brown.06
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For the final touch, turn your oven to the grill (broil) setting for the last 1-2 minutes. Keep a very close eye on it! Once it’s perfectly golden, remove it from the oven and let it rest for about 5 minutes before serving. Garnish with some fresh chopped parsley or chives if you like.07
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