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Chicken Mornay Casserole

Chicken Mornay is a delicious low-carb dinner made with chicken and broccoli in a scrumptious mornay sauce for a comforting meal that everyone loves.

Chicken Mornay Casserole Scooped From The Casserole Dish
Chicken Mornay Casserole is a low carb healthy weeknight dinner the whole family will enjoy

Watch our tutorial for making this delicious Cheesy Chicken Mornay

It takes a bit of time to chop up a fresh head of broccoli, so use pre-chopped flowerets if you are needing to speed things along.

You can also use frozen organic broccoli florets, just be sure to thaw the broccoli before you layer it in this casserole or your oven time will have to be increased.

Baked Chicken Mornay Casserole Showing The Cheesy Topping And Mornay Sauce Bubbling Through. Yum!
baked chicken mornay casserole showing the cheesy topping and Mornay sauce bubbling through. Yum!

What is Mornay Sauce made of?

Think of a Mornay Sauce as a cheesy bechamel, which is one of the most famous French sauces that is used in a wide variety of meals. Mornay sauce is made with a base of flour, egg, milk, and butter; but then has cheese melted in creating a sumptuous sauce that rich creamy and delicious.

Traditionally, mornay sauces have a mix of parmesan and gruyere cheeses melted in. We used what was on hand which was a delicious cheddar.

Mornay sauce is the formal French name, but most of use know this form of sauce as Alfredo.

How to make a healthier Chicken Mornay

You can skip the rotisserie chicken and use fresh chicken breast to reduce the sodium and added chemicals. For this recipe you will need about 1.5 pounds of boneless skinless chicken breasts. You will need to pre cook them in a skillet.

You can also boil your chicken and shred it. Cooked chicken is a snap to shred if you place it in a large bowl and use your hand mixer to break apart the meat.

Use this Healthy Homemade Mayonnaise Recipe. This mayo is a delicious homemade recipe you can make in about three minutes. It uses avocado oil which is a much healthier oil than what you will find in store bought mayonnaise.

Finally, you can make you own Chicken Bone Broth. During that process you can shred chicken and either use if for this meal, or freeze it for later.

Chicken Mornay Casserole Is Low Arb And Full Of Cheesy Goodness

Chicken Mornay Casserole Printable Recipe Card:

Chicken Mornay Casserole Scooped From The Casserole Dish
Yield: 12-1 Cup Servings

Chicken Mornay Casserole Recipe

Prep Time: 30 minutes
Cook Time: 45 minutes
Total Time: 1 hour 15 minutes

A Cheesy chicken Mornay Casserole bursting with broccoli goodness.  Chicken Mornay is a delicious low-carb dinner. This casserole is a healthier version of chicken comfort food.


  • 1/2 Cup evaporated milk
  • 2/3 cup mayonnaise
  • 2 Tablespoons butter
  • 1/8 cup flour
  • 1 tsp. nutmeg, (optional)
  • 2 12.5 oz. cans cooked chicken-undrained, OR 2 Cups pulled rotisserie Chicken
  • 3 cups grated cheddar cheese, to taste
  • 2 lbs fresh or frozen broccoli


  1. Preheat oven to 350 degrees
  2. Grease a 9x13 casserole
  3. Shred the cheese and set aside
  4. Steam the broccoli until tender. Set aside
  5. Open the cans of chicken and reserve 1 cup of the chicken broth

For the sauce:

  1. Melt 2 tablespoons butter in a two quart sauce pan on medium high.
  2. As it starts to bubble whisk in the flour and as it thickens quickly pour in the chicken broth and whisk in the mayonnaise. 
  3. Stir until the sauce thickens slightly and add in the milk.
  4. Add 1 cup shredded cheese and nutmeg.
  5. Continue to cook at a low boil whisking constantly until the sauce is thickened. Remove from heat.(sauce will thicken more as it cools). 

Casserole Assembly:

  1. Layer the broccoli in the bottom of the casserole dish.
  2. Pour 1/2 sauce and sprinkle 1 Cup of the cheese over the broccoli.
  3. Layer all the chicken next.
  4. Pour the rest of the sauce on the chicken and sprinkle remaining shredded cheese on top.
  5. Bake about 30 minutes uncovered or until golden brown and bubbly.


You can use fresh chicken if you prefer. Cut boneless skinless chicken breasts into 1/2 Inch chunks. Pan fry chicken covered with a bit of oil over medium heat (while the broccoli steams) until done. 

You will need an additional 1 Cup of chicken broth to make the Mornay sauce, or replace the chicken broth with water.

More Recipe TIPS:

  1. Using canned chicken very convenient, fast and easy BUT it may add too much saltiness to the recipe for you. Choose a  low sodium canned chicken. 
  2. OR
  3. If you prefer to use raw chicken breasts you will need about 1 1/2 lbs. of skinless boneless chicken breasts. Chop them up into 1/2 inch pieces and precook in your skillet over medium heat.
  4. You will also need to add a 1 cup of chicken broth and seasonings (1 tsp. of salt) to your taste to get the flavor.
  5. With the canned chicken and cheese you won't need any extra salt in this recipe.  Today I have one puny little chicken breast that needs using so I cut it up and pan fried it to just done before adding it in with a 12 oz. can of chicken for this recipe.
  6. Use THIS  Healthy Homemade Mayonnaise Recipe To improve the fats in this casserole. This mayo is REALLY flavorful, you can make it about three minutes and it uses avocado oil. WAY better than store bought.
  7. This recipe is a snap when you use store bought rotisserie chicken meat. Most store deli's have it now. I buy mine most often from Costco Pulled rotisserie chicken meat.
  8. Purchased shredded seasoned and cooked chicken adds a lot of flavor to recipes like this one. However, if you want to cut the salt in this chicken casserole, you can boil a chicken debone it and shred the meat.
  9. Use your own seasoning and go light on the salt. Another thing I like to do is make chicken bone broth in my instant pot, in that process I can make shredded chicken and freeze it for later.

Nutrition Information



Serving Size


Amount Per Serving Calories 400Total Fat 29gSaturated Fat 11gTrans Fat 0gUnsaturated Fat 16gCholesterol 110mgSodium 453mgCarbohydrates 7gFiber 2gSugar 2gProtein 28g

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If your family loves chicken casseroles, here are some of our favorites

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Chicken Mornay is a delicious low-carb dinner. Your family will enjoy this Cheesy chicken casserole. It’s bursting with broccoli cheese goodness.


Wednesday 2nd of March 2022

Can I substitute half and half for the evaporated milk. Evaporated milk has too much lactos which is sugar, which is carbs. I'm also allergic to lactose and half and half has very little lactose.


Wednesday 2nd of March 2022

Hi Kazy, Half and half or even heavy cream should be a good substitute for the evaporated milk. Thanks for asking. I hope you enjoy the recipe. Have a wonderful day. :)


Monday 21st of September 2020

This is going on my to-do cooking list. It looks delicious; but, more important, it looks easy enough for me to make it. Thanks!


Monday 21st of September 2020

This is one of our old favorites from WAY back. My sister in law gave this to me on a paper recipe card back in the dys before internet. We still love it. Enjoy!


Sunday 7th of October 2018

This casserole is so yummy!


Tuesday 25th of September 2018

I was looking for a recipe to use the rotisserie chicken I bought yesterday (and didn't use). Thank you. I will be making this tonight! Looks wonderful! I can almost taste it now


Tuesday 25th of September 2018

Hi Joyceski, Please let us know how you like it. A family favorite at our house. Enjoy!


Wednesday 1st of October 2014

What a divine comforting mixture. I love the combo of broccoli, chicken, and ofcourse the mornay sauce.


Thursday 2nd of October 2014

Thank you Nadia for the kind words. It is very tasty!

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