Broccoli Chicken Casserole Recipe

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Clarence Hayes Modified: March 25, 2022
Broccoli Chicken Casserole Recipe

How To Make Broccoli Chicken Casserole

An easy to make dinner meal that takes only one hour to make! This broccoli chicken casserole is loaded with gooey cheeses, tender chicken, and pasta.

Preparation: 15 minutes
Cooking: 45 minutes
Total: 1 hour



  • 8ozpasta,uncooked
  • 1large broccoli head,(about 1 lb of florets), cut into bite-sized florets
  • 2tbspbutter,or olive oil
  • 1small white onion,thinly sliced
  • 8ozbaby bella cremini mushrooms,thinly sliced
  • 4garlic cloves,minced
  • 3tbspflour
  • 1cupvegetable stock,or chicken stock
  • cupsmilk
  • 1tspdijon mustard
  • ½tspfine sea salt
  • ¼tspfreshly black pepper,cracked
  • 2cupssharp cheddar cheese,(8 ounce), shredded, divided
  • 2cupschicken,cooked, diced or shredded


  1. Heat the oven to 400 degrees F.

  2. Cook pasta in a large stockpot of generously-salted boiling water until it is al dente. 

  3. About 1 minute before the pasta is done, add the broccoli to the boiling pasta water and stir until combined. Drain both the pasta and broccoli, and set aside.

  4. Heat the butter in a large sauté pan over medium-high heat. Add the onion and sauté for 3 minutes, stirring occasionally. 

  5. Add the mushrooms and garlic and sauté for 5 more minutes, stirring occasionally or until the mushrooms are cooked through.

  6. Sprinkle the flour evenly over the onion mixture and stir until combined. Cook for 1 minute, stirring occasionally. 

  7. Add in the stock, and stir everything together until most of the clumps are gone. Add in the milk, Dijon, salt, and pepper and stir until combined. 

  8. Continue cooking the sauce until it reaches a simmer. Then remove from heat and stir in 1 cup of the shredded cheese until it is combined. Taste and season with additional salt and pepper, if needed.

  9. In a large 9×13-inch baking dish, combine the cooked pasta, broccoli, mushroom sauce, and chicken. Toss until combined.  Smooth the casserole out into an even layer.

  10. Bake uncovered for 15 minutes then remove pan from the oven, sprinkle the remaining cheddar cheese evenly on top of the casserole, and bake for 10 more minutes or until the cheese is nice and melty.

  11. Serve warm, garnished with extra black pepper and/or fresh herbs, and enjoy!


  • Calories: 564.77kcal
  • Fat: 28.91g
  • Saturated Fat: 14.28g
  • Trans Fat: 0.72g
  • Monounsaturated Fat: 8.22g
  • Polyunsaturated Fat: 2.71g
  • Carbohydrates: 46.69g
  • Fiber: 5.16g
  • Sugar: 7.57g
  • Protein: 31.38g
  • Cholesterol: 96.16mg
  • Sodium: 599.00mg
  • Calcium: 456.02mg
  • Potassium: 891.20mg
  • Iron: 2.22mg
  • Vitamin A: 235.94µg
  • Vitamin C: 115.33mg
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