Tender chicken, bright green broccoli, and a creamy cheddar sauce make this Cheesy Broccoli Chicken Bake a comforting dinner with simple ingredients. A buttery breadcrumb topping adds a little crunch, while the sauce settles around the chicken and vegetables underneath.
This version uses cooked chicken and a homemade cheese sauce, so there’s no condensed soup needed. Rotisserie chicken makes preparation easier, and briefly steaming the broccoli before baking helps it turn tender without becoming mushy.
Serve it over rice, alongside roasted potatoes, or with crusty bread for scooping up the extra sauce.
Why You’ll Love This Recipe
- Uses cooked chicken: A handy way to turn leftovers into dinner.
- Homemade cheddar sauce: Creamy and flavorful without canned soup.
- A crisp topping: Buttered panko adds texture to every serving.
- Easy to prepare ahead: Assemble earlier and bake when you need it.
- Flexible serving options: Pair it with rice, noodles, potatoes, or a salad.
Recipe at a Glance
- Prep time: 20 minutes
- Bake time: 25–30 minutes
- Resting time: 5–10 minutes
- Total time: About 50–60 minutes
- Servings: 6
- Baking dish: 9×13 inches, approximately 3-quart capacity
- Oven temperature: 375°F (190°C)
Ingredients
For the Chicken and Broccoli
- 4 cups (about 560 g) cooked chicken, chopped or shredded
- 6 cups (about 450 g) broccoli florets, cut into bite-sized pieces
For the Cheddar Sauce
- 3 tablespoons (42 g) unsalted butter
- 1 small yellow onion, finely diced
- 2 garlic cloves, minced
- ¼ cup (30 g) all-purpose flour
- 2 cups (480 ml) whole milk
- 1 cup (240 ml) low-sodium chicken broth
- 1 teaspoon Dijon mustard
- ½ teaspoon fine salt, plus more to taste
- ¼ teaspoon black pepper
- 2 cups (225 g) shredded sharp cheddar cheese, divided
For the Topping
- ¾ cup (45 g) panko breadcrumbs
- 2 tablespoons (28 g) unsalted butter, melted
- ¼ teaspoon paprika
Ingredient note: The chicken must be fully cooked before assembly. The baking time is intended to heat the casserole through and brown the topping.
Ingredient Notes
Chicken: Rotisserie chicken, leftover roast chicken, or simply cooked chicken breasts all work. Keep the pieces small enough to eat comfortably with a fork.
Broccoli: Fresh florets give you the most control over texture. Cut larger florets into smaller pieces and thinly slice any tender stems.
Sharp cheddar: Gives the sauce a noticeable cheese flavor. Freshly shredded cheese generally melts more smoothly than pre-shredded cheese.
Dijon mustard: Adds a little tang to balance the milk and cheese. It won’t make the casserole taste strongly of mustard.
Panko: These coarse breadcrumbs make a light, crisp topping. Regular plain breadcrumbs also work, though the texture will be finer.
How to Make Cheesy Broccoli Chicken Bake
1. Prepare the Oven and Dish
Preheat the oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
2. Briefly Cook the Broccoli
Steam the broccoli for 3–4 minutes, just until bright green and barely tender. It should still have a firm bite because it will continue cooking in the oven.
Drain thoroughly and spread on a clean kitchen towel or paper towels to release excess moisture.
3. Soften the Onion and Garlic
Melt 3 tablespoons of butter in a large saucepan over medium heat.
Add the diced onion and cook for 4–5 minutes, stirring occasionally, until softened. Add the garlic and cook for another 30 seconds.
4. Make the Sauce
Sprinkle the flour over the onion mixture. Stir constantly for 1–2 minutes.
Slowly whisk in the milk, adding a little at a time at first to keep the sauce smooth. Whisk in the chicken broth, Dijon mustard, salt, and pepper.
Bring to a gentle simmer. Cook for 3–5 minutes, stirring frequently, until the sauce lightly coats the back of a spoon.
5. Stir in the Cheese
Remove the saucepan from the heat. Add 1½ cups of the cheddar in small handfuls, stirring until melted.
Taste and adjust the seasoning. The sauce should be creamy and pourable rather than thick and stiff.
6. Assemble the Casserole
Place the cooked chicken and drained broccoli in a large bowl. Pour the cheese sauce over them and fold gently until evenly coated.
Transfer to the prepared baking dish. Spread into an even layer and sprinkle with the remaining ½ cup cheddar.
7. Add the Breadcrumb Topping
In a small bowl, stir together the panko, melted butter, and paprika.
Scatter evenly over the casserole without pressing it down.
8. Bake Until Golden and Bubbling
Bake uncovered for 25–30 minutes, until the topping is golden, the edges are bubbling, and the center reaches 165°F (74°C).
If the topping browns before the middle is hot, loosely cover the dish with foil and continue baking.
9. Rest Before Serving
Let the casserole rest for 5–10 minutes. This gives the sauce a chance to settle before you spoon it onto plates.
Tips for the Best Results
Dry the broccoli well. Water trapped in the florets can thin the sauce as the casserole bakes.
Keep the broccoli slightly firm. Fully cooking it before assembly can leave it too soft after baking.
Whisk the liquid in gradually. A slow start helps prevent flour lumps.
Add cheddar off the heat. High heat can make the cheese sauce grainy or oily.
Don’t overbake. Once the center is hot, the casserole is ready. Extra time in the oven can dry out the chicken.
Keep the topping loose. Lightly scattered crumbs crisp more evenly than a tightly packed layer.
Easy Variations
Add Mushrooms
Sauté 8 ounces of sliced mushrooms until browned and their released liquid has evaporated. Fold them into the chicken and broccoli before adding the sauce.
Give It a Little Heat
Add a pinch of cayenne to the sauce or replace ½ cup of the cheddar with pepper jack cheese.
Use Leftover Turkey
Substitute cooked turkey for the chicken in the same amount. It’s a simple way to use leftover roast turkey.
Make a Cracker Topping
Replace the panko with ¾ cup of coarsely crushed buttery crackers. Reduce the melted butter in the topping to 1 tablespoon.
What to Serve with It
Rice catches the extra cheddar sauce nicely, while egg noodles make a soft, buttery base. For a different texture, serve the casserole with roasted potatoes.
A green salad with lemon dressing or a tangy vinaigrette helps balance the richness. If you prefer a simpler plate, serve generous portions with a slice of crusty bread.
Make-Ahead Instructions
Assemble the chicken, broccoli, sauce, and cheese in the baking dish up to 1 day ahead. Cover and refrigerate promptly. Keep the breadcrumb topping separate so it stays dry.
When ready to bake, add the topping. Bake at 375°F (190°C), loosely covered, for about 20 minutes, then uncover and continue for 15–25 minutes, until golden and the center reaches 165°F (74°C).
A chilled casserole takes longer to heat through. Follow your baking dish manufacturer’s guidance about moving it from the refrigerator to a hot oven.
Storage and Reheating
Refrigerate leftovers in shallow, covered containers within 2 hours and use within 3–4 days.
For individual servings, microwave in short intervals until the center reaches 165°F (74°C). The topping will soften.
To preserve more of the topping’s texture, reheat in an oven-safe dish at 350°F (175°C), loosely covered, until hot throughout. Uncover for the final few minutes.
You can freeze cooled portions for up to 2 months for best quality. Thaw overnight in the refrigerator before reheating. The broccoli will be softer, and the sauce may separate slightly.
Frequently Asked Questions
Can I use frozen broccoli?
Yes. Use approximately 1 pound (450 g) of frozen broccoli florets. Thaw completely and drain very well, gently pressing out excess water. Skip the initial steaming step because frozen broccoli has already been blanched.
Can I use raw chicken?
Not with this method. Cook the chicken first, then chop or shred it before mixing it with the sauce.
Can I add uncooked rice?
No. This recipe doesn’t contain the extra liquid or baking time needed to cook dry rice. Prepare rice separately and serve the casserole over it.
Why is my casserole watery?
The broccoli may not have been drained sufficiently, or the sauce may not have simmered long enough to thicken. Steam the broccoli briefly, dry it well, and cook the sauce until it lightly coats a spoon.
Yes. Leave off the panko, topping butter, and paprika. Finish with the reserved cheddar and bake until the casserole is hot and bubbling.
Can I use a different cheese?
Monterey Jack, Colby, or a cheddar blend will work, though the flavor will be milder. Use a cheese that melts well, and avoid adding it over high heat.
Can I make a smaller batch?
Halve all the ingredients and use an 8×8-inch baking dish. Start checking after 20 minutes, then continue until the center reaches 165°F (74°C) and the topping is golden.
