Chicken Broccoli Alfredo Casserole

We used cooked rotisserie chicken and Rao’s Alfredo Sauce to make this low-carb Chicken Broccoli Alfredo Casserole easy to get on the table! But if you prefer to cook chicken breasts and make your own sauce, I’ll give instructions for that too.

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This new recipe for Chicken Broccoli Alfredo Casserole came about because over and over on Facebook people asked me what to use in Cheesy Chicken Broccoli Curry Casserole if you don’t like curry powder! And one day after about four people had asked me that, the idea popped into my mind to make a creamy casserole with chicken and broccoli that didn’t involve curry.

Kara and I experimented with this recipe a couple of times, but the one we ended up liking the best used one of those packs of rotisserie chicken meat from Costco and Alfredo sauce from a jar! If you don’t like to use convenience products like that, I’ll also give you tips for making your own sauce and cooking chicken breasts for the chicken.

The casserole also has plenty of cheese, and we used a Kroger product called Alpine Blend that’s a mixture of thick-cut shredded Swiss and Gruyere cheese, combined with a little Parmesan cheese on top. But any grated Swiss cheese will be fine. If you like the idea of a cheesy chicken and broccoli casserole, I hope you’ll try this recipe. This is quick, easy, and delicious for a week-night dinner!

What ingredients do you need?

(This is only a list of ingredients; please scroll down for complete printable recipe. Or if you use the JUMP TO RECIPE link at the top of the page, it will take you directly to the complete recipe.)

Why do I use Rao’s Alfredo Sauce?

I love Rao’s Pasta Sauce, both for the flavor and the low carbs. But they are definitely more expensive than some brands. I try to stock up when they go on sale or buy them at Costco, but if another brand of Alfredo works better for you, no worries. Or if you want to make your own sauce, something like Creamy Cauliflower Sauce or Keto Alfredo Sauce would work for this recipe.

What if you don’t want to buy rotisserie chicken breast for this recipe:

We used about two pounds of Costco rotisserie chicken breast for the chicken. But if you prefer to cook your own chicken and cut it up, you can use four medium-sized boneless, skinless chicken breasts, cooked in a little olive oil in a frying pan over medium-high heat. Try to cook the chicken until it’s cooked through but not overdone. (Chicken that isn’t completely cooked will release some liquid as it finished cooking in the casserole.)

Can you use more broccoli in this recipe?

We used six cups of broccoli pieces for this casserole but if you like a lot of broccoli, one or two cups more broccoli wouldn’t hurt. And next time I make it I think I will use a bit more broccoli!

More Casseroles with Chicken:

How to make Chicken Broccoli Alfredo Casserole:

(This is only a summary of the steps for the recipe; please scroll down for complete printable recipe. Or if you use the JUMP TO RECIPE link at the top of the page, it will take you directly to the complete recipe.)

1. Preheat oven to 375F/190C. Spray casserole dish with olive oil or non-stick spray.
2. Dice up onion, heat olive oil in large frying pan, and cook until onion is slightly brown. Add minced garlic and cook 1-2 minutes more.
3. When onion and garlic are cooked, add Alfredo sauce, poultry seasoning, ground thyme, Spike Seasoning, black pepper, and sour cream. Stir and let it start to simmer over low heat.
4. Cut up rotisserie chicken (or chicken breasts you cooked yourself) and add to sauce. Simmer about 5 minutes.
5. Cut up broccoli into bite-sized pieces, put in bowl (or large 8 quart measuring cup like I used) and microwave broccoli 1-2 minutes, depending on how cooked you like it.
6. Gently stir partly cooked broccoli into the chicken sauce mixture. Add 1 cup of grated Swiss cheese, and gently mix in. 
7. Transfer mixture to the casserole dish.
8. Top with the rest of Swiss cheese and the Parmesan cheese.
9. Bake 25-30 minutes, or until bubbling hot and starting to brown on top.
10. Serve hot.
11. This will keep in the fridge for several days. It’s also not bad when it’s been frozen, thawed, and reheated, although the broccoli will get a little softer after it’s been frozen.

Make it a Low-Carb Meal:

This Chicken Broccoli Alfredo Casserole is a fairly rich dish, so I’d serve it with something simple like Mary’s Perfect Easy Spring Mix Salad, Kalyn’s Favorite Baby Arugula Salad, or Cucumber Salad with Balsamic Dressing.

Weekend Food Prep:

This casserole is perfect to make on the weekend and reheat leftovers during the week, so I’m adding it to my category for Weekend Food Prep.

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
This Chicken Broccoli Alfredo Casserole a good dish for any low-carb diet plan, and it might work for Keto if you’re not limiting carbs that strictly. It’s probably too high in fat for the original South Beach Diet.

Find More Recipes Like This One:
Use Casseroles to find more recipes like this one. Use the Diet Type Index to find more recipes suitable for a specific eating plan. You might also like to follow Kalyn’s Kitchen on Pinterest, on Facebook, on Instagram, on TikTok, or on YouTube to see all the good recipes I’m sharing there.

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