This cheesy chicken and broccoli casserole is the recipe that turns the classic chicken and broccoli combination into something so deeply satisfying and richly cheesy that it becomes the most requested dinner in your weekly rotation. Tender shredded chicken and bright green broccoli florets baked together in a rich homemade sharp cheddar cream sauce with a golden bubbling cheese crust on top that caramelizes beautifully in the oven. I have been making this cheesy chicken and broccoli casserole at Golden Recipes for years and it consistently earns the most enthusiastic responses of any casserole I make — people who claim not to like broccoli devour it completely and immediately ask when I am making it again. The secret is the homemade cheddar sauce that is so deeply flavored and silky that it transforms the broccoli from a plain vegetable into something genuinely indulgent. This is the casserole that makes eating your vegetables feel like an absolute treat.
Why You’ll Love This Cheesy Chicken and Broccoli Casserole
The homemade sharp cheddar cream sauce is the element that makes this casserole so completely extraordinary compared to any version made with cream of mushroom soup. A proper butter and flour roux whisked together with chicken broth, whole milk, and heavy cream creates a sauce that is deeply flavorful, genuinely silky, and tastes like real homemade cooking rather than a canned shortcut. The dry mustard powder adds a subtle tangy depth that amplifies the sharpness of the cheddar in the most incredible way — it is the classic technique from Welsh rarebit that makes cheese sauces taste more deeply cheesy without adding any actual mustard flavor. Together with the sharp cheddar the sauce has a bold complex cheese flavor that coats every piece of broccoli and chicken in absolute perfection.
Blanching the broccoli before baking is the technique that keeps it bright green and perfectly tender rather than grey and mushy. Just 3 minutes in boiling salted water followed by an immediate rinse in cold water sets the vivid green color and pre-cooks the broccoli just enough that it finishes perfectly during the 30-minute bake — tender-crisp with a beautiful color that makes the casserole look as good as it tastes. You should also try our Cheesy Broccoli Rice Casserole and our Cheesy Chicken Broccoli Alfredo Bake for more incredible cheesy broccoli and chicken dinners.
Equipment You’ll Need
- Large saucepan for the cheese sauce
- 9×13 inch baking dish
- Large pot for blanching broccoli
- Whisk
- Measuring cups and spoons
- Aluminum foil
Ingredients
- 3 cups cooked shredded chicken — rotisserie perfect
- 5 cups fresh broccoli florets, cut small — blanched 3 minutes
- 3 tablespoons butter
- 3 cloves garlic, minced
- 3 tablespoons all-purpose flour
- 1½ cups chicken broth
- 1 cup whole milk
- ½ cup heavy cream
- ½ teaspoon dry mustard powder
- 1 teaspoon garlic powder
- ½ teaspoon smoked paprika
- ½ teaspoon onion powder
- Salt and black pepper to taste
- 2½ cups freshly shredded sharp cheddar — divided
- ½ cup freshly grated Parmesan
For the Topping
- ¾ cup panko breadcrumbs
- 3 tablespoons butter, melted
- ¼ cup freshly grated Parmesan
- ½ teaspoon garlic powder
Substitutions
Frozen broccoli works — thaw completely and squeeze out all moisture before using. Colby Jack or Gruyère can replace or supplement the sharp cheddar. For a shortcut replace the from-scratch sauce with 2 cans of cream of chicken soup undiluted plus ½ cup milk. Add 1 cup of cooked white rice to the filling for a complete chicken broccoli rice casserole. Crushed Ritz crackers can replace panko for a butterier topping. For extra richness add 4 oz of softened cream cheese to the sauce.
How to Make Cheesy Chicken and Broccoli Casserole
Blanch the Broccoli
Preheat your oven to 375°F (190°C) and grease your 9×13 baking dish. Bring a large pot of salted water to a boil. Add the broccoli florets and blanch for exactly 3 minutes. Drain immediately and rinse under cold running water to stop the cooking — this preserves the vivid green color. Pat dry and set aside.
Make the Sharp Cheddar Sauce
Melt butter in a large saucepan over medium heat. Add garlic and cook 1 minute. Sprinkle flour and whisk constantly for 1 full minute. Slowly whisk in chicken broth then milk and cream preventing lumps. Add dry mustard, garlic powder, smoked paprika, onion powder, salt, and pepper. Simmer 4 to 5 minutes until thick. Remove from heat and stir in 2 cups of cheddar and all the Parmesan until completely melted and silky.
Assemble and Bake
In a large bowl combine the shredded chicken and blanched broccoli. Pour the cheddar sauce over everything and fold gently until every piece is well coated. Transfer to your baking dish. Scatter the remaining ½ cup of cheddar across the top. In a small bowl combine panko, melted butter, Parmesan, and garlic powder — scatter across the entire top. Bake uncovered for 30 to 35 minutes until the panko topping is deeply golden and the sauce is bubbling. Rest 5 minutes. Serve hot.
Variations
- Add rice — fold 2 cups cooked white rice into the filling for a complete one-dish meal
- Bacon addition — stir 1 cup crumbled cooked bacon into the filling
- Ritz topping — replace panko with crushed Ritz crackers for a butterier crust
- Four cheese — add Gruyère and mozzarella alongside the cheddar for complex flavor
- Mushroom addition — add 8 oz sautéed cremini mushrooms to the filling
What to Serve With It
This casserole is a complete dinner on its own. Warm dinner rolls are perfect alongside. A simple green salad with lemon vinaigrette adds freshness. For a complete cozy family dinner serve alongside our Cheesy Broccoli Potato Soup as a starter for the ultimate broccoli and cheese experience.
Pro Tips
- Blanch broccoli exactly 3 minutes — keeps it bright green and tender-crisp
- Dry mustard powder — essential for amplifying the cheddar flavor
- Add cheese completely off the heat — silky not grainy
- Always bake uncovered — panko needs direct heat to get golden
- Rest 5 minutes before serving
Common Mistakes
- Not blanching broccoli — grey mushy results
- Skipping dry mustard — sauce tastes less cheesy
- Adding cheese on the heat — grainy sauce
- Wet broccoli — watery casserole
- Covering while baking — soggy panko topping
Storage and Reheating
Store covered fridge up to 4 days. Scatter fresh panko on top and bake at 375°F 15 minutes uncovered to restore crunch. Microwave medium power. Freeze assembled before baking up to 2 months.
FAQ
Can I use frozen broccoli?
Yes — thaw completely and squeeze out every drop of moisture in a clean towel. Wet frozen broccoli makes the casserole watery. The texture is slightly softer than fresh blanched broccoli but still delicious.
What does dry mustard do in a cheese sauce?
Dry mustard amplifies the sharpness and complexity of cheddar cheese in the most remarkable way — it makes the sauce taste more deeply cheesy without adding any actual mustard flavor. It is a classic technique used in Welsh rarebit and the best mac and cheese recipes.
Can I make this ahead?
Yes — assemble without the panko topping and refrigerate up to 24 hours. Add panko before baking and bake as directed adding 10 extra minutes.
Can I use a shortcut sauce?
Yes — use 2 cans of cream of chicken soup undiluted plus ½ cup of milk and 1 cup of shredded cheddar stirred in. The from-scratch version is significantly better but the shortcut version is still very good and very fast.
Conclusion
This Cheesy Chicken and Broccoli Casserole is the ultimate comfort food for anyone who loves the classic chicken and broccoli combination — homemade sharp cheddar sauce, tender chicken, bright green broccoli, and a golden panko crust. Make it tonight and watch it become a permanent family favorite.