Chicken Broccoli Casserole

4.74 from 30 votes
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I’m a huge fan of this Chicken Broccoli Casserole, a tasty blend of perfectly cooked broccoli and succulent, juicy chicken, all smothered in a rich, creamy cheese sauce. It’s an easy recipe that’s free from any processed ingredients, making it a wholesome choice for any meal!

overhead shot of chicken broccoli casserole with a serving spoon inside the baking dish


Chicken Broccoli Casserole, also known as Chicken Divan, is a beloved warm classic that everyone adores. This particular recipe stands out because it achieves that lusciously smooth and creamy cheese sauce without relying on condensed soups. Instead, it uses just cream, broth, real cheese, and a touch of natural cornstarch, making it low-carb, gluten-free, and a lighter option. We all love how the tender pieces of chicken breast, mushrooms, and broccoli florets come together in a cheesy, herb-infused sauce. It’s the kind of comfort food that brings both satisfaction and joy!

serving spoon scooping out chicken casserole from a white baking dish

Ingredients For Chicken Broccoli Casserole

  • Cooked Chicken Breast: You’ll need 1-1 ½ pounds cooked chicken breast, shredded or chopped. Rotisserie chicken can be substituted.
  • Olive Oil
  • Baby Portobello Mushrooms: Also known as Crimini.
  • Broccoli Florets: About 4 cups total. Baby broccoli florets are great, but you can also use regular florets – if you do, cut larger florets into small, bite-sized pieces.
  • Fresh Garlic: Mince or put through a garlic press.
  • Salt and Pepper
  • Dried Basil, Oregano, and Thyme
  • Mozzarella Cheese: About 8 oz. shredded mozzarella, divided.
  • Chicken Broth: I use low-sodium broth.
  • Cornstarch
  • Heavy Whipping Cream: You’ll need ½ cup of cream; half-and-half may be substituted but the sauce may not be as thick.
  • Chopped Fresh Parsley: For garnish

How To Make Chicken Broccoli Casserole

  1. Chop/Shred the Chicken and Layer in Baking Dish: Preheat the oven to 350˚F. Lightly grease a 9×13 baking dish with cooking spray. Then shred or chop the cooked chicken and arrange in the baking dish.
  2. Saute the Veggies: Heat olive oil in a large skillet over medium-high heat. Add mushrooms to the hot oil and cook for 2 minutes. Stir in broccoli and garlic; season with salt, pepper, basil, and oregano, and continue to cook for 3 more minutes. Layer this mixture over the chicken.
  3. Make the Sauce: In a small mixing bowl, combine a tablespoon of chicken broth with cornstarch and whisk until pasty. Add the remaining chicken broth to the hot skillet; whisk in cornstarch paste, heavy cream, thyme, salt, and pepper. Cook until it just starts to thicken.
  4. Add the Sauce to the Casserole: Pour this sauce over the chicken mixture, and stir well; sprinkle with remaining cheese.
  5. Bake and Serve: Cover the baking dish with foil and bake for 15 minutes. Remove foil bake for 9 to 10 more minutes, or until light golden on top. Let stand 10 minutes before serving.

Recipe Tips

  • To make this casserole ahead, first prepare the chicken, veggies, and sauce separately. Then, assemble the entire casserole up to the point of baking. Cover and refrigerate for up to 2 days.
  • If you’re preparing the chicken breasts for this dish, rather than using a rotisserie, my stove top chicken breast method is super fast and easy. Simply season the chicken breasts, sear them for about 6-7 minutes per side, and finish with a tablespoon of butter.
  • If freezing, place the prepared chicken, veggies, and sauce in individual freezer bags, pushing out as much air as possible before sealing. Freeze for up to 3 months. To bake, thaw ingredients overnight in the refrigerator, assemble the casserole the following day, and bake according to the recipe.

Serving Suggestions

This dish has a lot of indulgent umami flavor, thanks to the mushrooms, cheese, chicken, and broccoli. I like to pair it with my Radish Cucumber Tomato Salad as a side or starter. A simple side of Maple Roasted Carrots adds color and sweetness to the menu. You can also serve this casserole with a Light Skillet Cornbread for the main course, followed by a surprising dessert, like my Strawberry Pretzel Dessert, to round out the menu.

overhead close up shot of chicken broccoli casserole with a serving spoon inside the baking dish

Storing and Reheating

  • Store leftovers in tightly-covered containers for up to 3 days or freeze for up to 3 months.
  • To reheat, thaw the casserole in the refrigerator (if frozen). Bake the leftovers at 350˚F, covered, until heated through.

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4.74 from 30 votes

Chicken Broccoli Casserole

This Chicken Broccoli Casserole is an easy, low-carb version of classic Chicken Divan, with tender white meat chicken, savory broccoli and mushrooms, and mozzarella cheese sauce.
Prep Time: 15 minutes
Cook Time: 35 minutes
Resting Time: 10 minutes
Total Time: 1 hour
Servings: 4 to 6 servings


  • 1 to 1.5 pounds cooked chicken breasts,, chopped or shredded; you can also use rotisserie chicken.
  • 2 tablespoons olive oil
  • 8 ounces sliced baby portobello mushrooms
  • 4 cups small broccoli florets
  • 3 cloves garlic,, minced
  • Salt and freshly ground pepper,, to taste
  • ½ teaspoon dried basil
  • ½ teaspoon dried oregano
  • 1 cup + 1 tablespoon low sodium chicken broth
  • 2 teaspoons cornstarch
  • ½ cup heavy whipping cream
  • ½ teaspoon dried thyme
  • salt and freshly ground black pepper,, to taste
  • 8 ounces shredded mozzarella cheese,, divided
  • ¼ cup grated parmesan cheese
  • red pepper flakes, , for garnish, optional
  • grated parmesan cheese,, for garnish, optional
  • chopped fresh parsley,, for garnish, optional
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  • Preheat oven to 350˚F. Lightly grease a 9×13 baking dish with cooking spray; set aside.
  • Heat olive oil in a large 12-inch skillet set over medium-high heat. Add mushrooms to the hot oil and cook for 2 minutes.
  • Stir in broccoli and garlic; season with salt, pepper, basil, and oregano, and continue to cook for 3 more minutes, or until just beginning to soften.
  • Shred or chop cooked chicken and arrange in baking dish.
  • Remove mushroom and broccoli mixture from pan and layer over the chicken. Set aside.
  • Set skillet back over medium-high heat. In a small mixing bowl combine 1 tablespoon chicken broth with 2 teaspoons cornstarch; whisk until pasty. Add 1 cup chicken broth to the hot skillet; to the skillet, whisk in the cornstarch paste, heavy cream, thyme, salt, pepper, half of shredded mozzarella, and parmesan cheese.
  • Remove from heat and pour sauce over chicken mixture inside the baking dish; using a spoon, stir and mix until thoroughly combined. Sprinkle top with remaining mozzarella cheese.
  • Cover baking dish with foil and bake for 15 minutes. Remove foil and continue to bake for 9 to 10 more minutes, or until cheese is melted and light golden brown on top.
  • Remove from oven and let stand 5 minutes. Garnish with red pepper flakes, grated parmesan cheese, and parsley. Serve.


Calories: 610kcal | Carbohydrates: 13g | Protein: 56g | Fat: 37g | Saturated Fat: 18g | Cholesterol: 187mg | Sodium: 600mg | Potassium: 909mg | Fiber: 3g | Sugar: 4g | Vitamin A: 1465IU | Vitamin C: 82mg | Calcium: 446mg | Iron: 3mg

Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.

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  1. Eva says:

    My chicken was frozen, my broccoli was frozen and I used gifted cheese that wouldn’t melt. It was STILL delicious!

  2. Lynn says:

    This was so good!! Very flavorful! I made it exactly as it was written except I had to use Monterrey Jack cheese instead of mozzarella. Next time I think I’ll do the same!!! My hubs loved it too. Trying to make only dinners with real ingredients that are not processed. This fit the bill perfectly!

  3. Sue says:

    We served this over fettuccini noodles and it was delicious. The broccoli was quite done enough for me so I will precook next time.

    1. Katerina Petrovska says:

      I’m glad you enjoyed it! Thank YOU! 🙂