If you are looking for a comforting dinner that brings together tender chicken, fluffy rice, fresh broccoli, and plenty of melted cheese, this Chicken Broccoli Rice Casserole is an easy recipe you will want to keep in your regular meal rotation. Everything is combined in a creamy, savory sauce and baked until hot, bubbly, and golden on top.
This recipe is perfect for busy weeknights, Sunday dinners, meal prep, potlucks, or anytime you need a satisfying family-style meal. Using cooked chicken and rice keeps preparation simple, while broccoli adds color, texture, and freshness to the rich creamy filling.
One of the best things about homemade chicken broccoli rice casserole is how adaptable it is. You can use leftover chicken, rotisserie chicken, different cheeses, brown rice, extra vegetables, or a crispy breadcrumb topping depending on what you have available.
Why You’ll Love This Chicken Broccoli Rice Casserole
This casserole combines protein, vegetables, rice, and cheese in one convenient baking dish.
Using already cooked chicken and rice makes assembly especially quick and helps ensure each component has the right texture.
The creamy sauce coats every bite without making the casserole overly soupy, while cheddar and Parmesan add plenty of savory cheese flavor.
It is also an excellent make-ahead meal. You can assemble the casserole earlier in the day, refrigerate it, and bake it when you are ready for dinner.
Ingredients
For the Casserole
- 3 cups cooked chicken, chopped or shredded
- 3 cups cooked white or brown rice
- 4 cups broccoli florets
- 1 tablespoon unsalted butter
- 1 small yellow onion, finely diced
- 3 garlic cloves, finely minced
- 2 cups shredded sharp cheddar cheese, divided
- ½ cup freshly grated Parmesan cheese
For the Creamy Sauce
- 3 tablespoons unsalted butter
- 3 tablespoons all-purpose flour
- 1½ cups low-sodium chicken broth
- 1 cup whole milk
- ½ cup sour cream
- 1 teaspoon Dijon mustard
- 1 teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon dried thyme
- ½ teaspoon kosher salt
- ¼ teaspoon freshly ground black pepper
For the Optional Crispy Topping
- ¾ cup panko breadcrumbs
- 2 tablespoons melted butter
- ¼ cup freshly grated Parmesan cheese
- ½ teaspoon Italian seasoning
How to Make Chicken Broccoli Rice Casserole
1. Preheat the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9 x 13-inch baking dish with butter or cooking spray.
Set it aside while you prepare the casserole.
2. Prepare the Broccoli
Bring a small pot of water to a boil.
Add the broccoli florets and cook for approximately 2 minutes.
Immediately drain and rinse briefly under cold water.
The broccoli should be bright green and only partially tender because it will continue cooking in the oven.
You can also steam the broccoli for 2–3 minutes.
3. Prepare the Chicken
Chop or shred the cooked chicken into bite-sized pieces.
Rotisserie chicken, leftover roasted chicken, poached chicken, or baked chicken breasts all work well.
Make sure the chicken is already fully cooked before assembling the casserole.
4. Cook the Onion
Melt 1 tablespoon butter in a large skillet over medium heat.
Add the finely diced onion.
Cook for approximately 4–5 minutes, stirring occasionally, until softened.
5. Add the Garlic
Add the minced garlic.
Cook for approximately 30–60 seconds until fragrant.
Transfer the onions and garlic to a large mixing bowl.
6. Start the Creamy Sauce
In the same skillet or a medium saucepan, melt 3 tablespoons butter over medium heat.
Sprinkle in the flour.
Whisk continuously for approximately 1–2 minutes.
The mixture should become smooth and lightly bubbly.
This creates a roux that will thicken the casserole sauce.
7. Add the Chicken Broth
Slowly pour in the chicken broth while whisking continuously.
Adding the broth gradually helps prevent lumps.
Continue whisking until smooth.
8. Add the Milk
Pour in the milk.
Add the Dijon mustard, garlic powder, onion powder, thyme, salt, and black pepper.
Cook over medium-low heat for approximately 3–5 minutes, stirring frequently.
The sauce should begin to thicken enough to lightly coat the back of a spoon.
9. Add the Sour Cream
Reduce the heat to low.
Stir in the sour cream until completely smooth.
Avoid allowing the sauce to boil aggressively after adding the sour cream.
10. Add the Cheese
Add 1 cup cheddar cheese and the Parmesan gradually.
Stir until melted and smooth.
Taste and adjust the seasoning if needed.
If the sauce becomes too thick, add a small splash of chicken broth or milk.
11. Combine the Casserole
Add the cooked rice, chicken, broccoli, onions, and garlic to a large bowl.
Pour the creamy cheese sauce over everything.
Gently stir until evenly coated.
Make sure the broccoli remains in reasonably large pieces rather than breaking it up too much.
12. Transfer to the Baking Dish
Spoon the mixture into the prepared baking dish.
Spread it into an even layer.
Press gently, but do not pack it down tightly.
13. Add the Cheese Topping
Sprinkle the remaining 1 cup cheddar cheese evenly over the casserole.
For an extra-cheesy finish, add a little additional Parmesan.
14. Prepare the Crispy Topping
If using the breadcrumb topping, combine the panko, melted butter, Parmesan, and Italian seasoning in a small bowl.
Mix until the breadcrumbs are evenly coated.
Sprinkle over the cheese.
15. Bake the Casserole
Place the casserole in the preheated oven.
Bake uncovered for approximately 25–30 minutes, or until heated throughout and bubbling around the edges.
The cheese should be completely melted.
16. Brown the Top
For a more golden finish, switch the oven to broil for 1–2 minutes.
Watch closely because cheese and breadcrumbs can brown very quickly.
17. Rest Before Serving
Remove the casserole from the oven.
Allow it to rest for approximately 5–10 minutes.
This helps the creamy filling settle and makes the casserole easier to portion.
18. Garnish and Serve
Sprinkle with fresh parsley, extra Parmesan, or freshly cracked black pepper.
Serve warm.
What to Serve With Chicken Broccoli Rice Casserole
This casserole is filling enough to serve as a complete dinner because it already contains chicken, rice, broccoli, and cheese.
For something fresh, pair it with a garden salad, Caesar salad, cucumber salad, or tomato salad.
Warm dinner rolls, garlic bread, biscuits, or crusty bread also work well.
For additional vegetables, serve roasted carrots, asparagus, green beans, or Brussels sprouts on the side.
Tips for the Best Chicken Broccoli Rice Casserole
Use cooked rice rather than raw rice for predictable texture.
Cook the broccoli only briefly before baking.
Drain the broccoli thoroughly so it does not water down the sauce.
Use cooked chicken to keep the baking time short.
Freshly shred the cheese whenever possible for smoother melting.
Keep the cream sauce slightly loose before baking because the rice will absorb some moisture.
Do not overbake the casserole.
Let it rest before serving.
Use low-sodium broth so you can control the seasoning.
Add breadcrumbs only if you want a crispy topping.
Easy Recipe Variations
Extra Cheesy Chicken Broccoli Rice Casserole
Increase the cheddar and add mozzarella or Monterey Jack.
Chicken Broccoli Mushroom Casserole
Sauté 8 ounces sliced mushrooms with the onions before assembling.
Bacon Chicken Broccoli Casserole
Add ½ cup crispy crumbled bacon.
Chicken Broccoli Brown Rice Casserole
Use cooked brown rice for a nuttier flavor and firmer texture.
Spicy Chicken Broccoli Casserole
Add diced jalapeños, cayenne pepper, red pepper flakes, or pepper Jack cheese.
Garlic Parmesan Chicken Rice Casserole
Increase the garlic and Parmesan for a stronger savory flavor.
Chicken Broccoli Cauliflower Rice Casserole
Replace some or all of the rice with cooked cauliflower rice.
Make sure it is well drained to prevent excess moisture.
Chicken Broccoli Ham Casserole
Add 1 cup diced cooked ham for a heartier variation.
How to Store Leftovers
Allow the casserole to cool before transferring leftovers to an airtight container.
Refrigerate for up to 3–4 days.
To reheat, place individual portions in the microwave until hot throughout.
For a larger portion, cover the baking dish loosely with foil and reheat at 350°F (175°C) until warmed through.
If the casserole seems dry after refrigeration, add a small splash of milk or chicken broth before reheating.
You can also freeze the casserole for up to approximately 2–3 months.
For best results, freeze individual portions or assemble the casserole without the breadcrumb topping and freeze before baking.
Thaw overnight in the refrigerator before reheating or baking.
Frequently Asked Questions
Can I use rotisserie chicken?
Yes.
Rotisserie chicken is one of the easiest options for this casserole.
Remove the skin and bones, then chop or shred the meat.
Can I use frozen broccoli?
Yes.
Thaw it first and drain it very thoroughly.
There is usually no need to blanch frozen broccoli before adding it.
Can I use uncooked rice?
This particular recipe is designed for cooked rice.
Using raw rice would require significantly more liquid and a longer baking time.
What cheese works best?
Sharp cheddar is a classic choice.
Mozzarella, Monterey Jack, Colby Jack, Gruyère, or a combination of cheeses also works well.
Can I prepare this casserole ahead?
Absolutely.
Assemble it, cover tightly, and refrigerate for up to about 24 hours before baking.
You may need to add several extra minutes to the baking time if it goes into the oven cold.
Why is my casserole dry?
There may not have been enough sauce, or the casserole may have been baked too long.
Keep the sauce creamy and slightly loose before assembling and remove the casserole once it is hot and bubbling.
Can I make this without sour cream?
Yes.
Plain Greek yogurt can be substituted, or you can use a little additional milk and cream cheese.
Can I add more vegetables?
Absolutely.
Mushrooms, peas, spinach, carrots, bell peppers, or cauliflower all work well.
Final Thoughts
This Chicken Broccoli Rice Casserole combines tender chicken, fluffy rice, fresh broccoli, cheddar, Parmesan, and a creamy homemade sauce in one comforting family-style dinner.
The creamy filling and melted cheese make it satisfying, while the broccoli keeps the casserole colorful and balanced with plenty of texture.
Serve it warm with a fresh salad, roasted vegetables, or garlic bread for an easy weeknight meal that is also perfect for potlucks, meal prep, and cozy family dinners.