Chicken Broccoli Alfredo Casserole With Creamy Cheese Sauce
Chicken Broccoli Alfredo Casserole is a creamy, hearty baked dinner made with tender chicken breast, broccoli florets, and rich Alfredo sauce. My husband is a broccoli guy, so I wanted a casserole that was easy to pull together but still felt like a meat-packed, yet veggie-forward dinner. This chicken broccoli Alfredo casserole did the trick so well he asked me to pack up the leftovers for his work lunches, and that’s how I know it’s a keeper.
Some nights I just want to slide a hot pan onto the table and call it done, and this is the one I reach for. You get tender chicken tucked into a creamy Alfredo sauce, broccoli chopped small enough to sneak into every bite, and Swiss cheese melted right in so the whole casserole stays thick and smooth. A little sour cream keeps it rich without feeling too heavy, and when it comes out bubbling with those golden edges, it feels like a complete meal without any fuss.
Cooking for six kids plus my husband means I don’t make small dinners. This casserole dinner keeps everyone satisfied, which is why it stayed in regular rotation at our table for years. I also like that I can use whatever cooked chicken I already have on hand, whether it’s leftover from earlier in the week or pulled from a Costco rotisserie chicken. It is easy to serve and if we’re lucky enough to have leftovers, they warm up just as creamy the next day, which makes lunch simple.
Key Ingredients
Here’s a quick overview of the key ingredients for this recipe. For the full list of ingredients and exact measurements, jump to the recipe card at the bottom of this post.
- Chicken Breast: Use cooked chicken breast, diced into even, bite-sized pieces, so it distributes well throughout the casserole. Leftover roasted chicken or rotisserie chicken both work well, or you can prepare a tender Crockpot whole chicken or make shredded chicken in an Instant Pot ahead of time and keep it on hand for recipes like this.
- Broccoli Florets: Cut into bite-sized pieces so they cook evenly and blend into each scoop. Drain well after microwaving so extra moisture doesn’t thin the sauce.
- Alfredo Sauce: Use a good-quality jarred Alfredo sauce. If the sauce is very thick, stirring it well before adding helps it blend smoothly with the sour cream.
- Sour Cream: Use full-fat sour cream for the smoothest texture. Stir it before adding so there are no cold lumps going into the sauce.
- Swiss Cheese: I recommend buying a block and grating it yourself, if you can, for the smoothest melt. Pre-shredded cheese can sometimes melt less evenly.
- Parmesan Cheese: Freshly grated Parmesan melts and browns better than shelf-stable varieties. Avoid the powdered kind for this recipe.
Smart Substitutions
Frozen broccoli can be used instead of fresh, just thaw it first and drain it well. If Swiss isn’t your favorite, mozzarella melts smoothly and creates a slightly different flavor profile. You can also use homemade Alfredo sauce instead of a jarred kind, if that’s what you prefer.
Chicken and Broccoli Essentials
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Buy Now → How To Make Chicken Broccoli Alfredo Casserole
This comes together in one skillet and one baking dish. Build the sauce first, stir everything together, then bake until hot and bubbling.
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Tip: Let the casserole rest for about 5 to 10 minutes before serving so it sets slightly and scoops neatly. For a similar family-friendly meal, check out my other one-skillet creamy chicken and biscuit casserole.
Variations and Recipe Tips
If I want the top a little more golden, I’ll switch the oven to broil for a minute or two at the end and keep an eye on it.
Sometimes I add a little extra black pepper right before baking if I want a slightly stronger finish.
If your Alfredo sauce is extra thick, a small splash of milk stirred in before simmering can loosen it slightly without changing the flavor.
This casserole freezes well before baking, which makes it easy to prep ahead.
When reheating leftovers, cover the dish and warm gently so the sauce stays smooth.
How You Can Practice Hospitality With Chicken Broccoli Alfredo Casserole
Invite a newer couple from church or a family you’ve been meaning to get to know for dinner, but instead of eating inside, set the table out in the backyard to enjoy the evening air. Hang a few string lights, light some lanterns, and place the casserole in the center. You might add simple sides like a loaf of cheesy zucchini bread with rosemary or a simple spinach arugula salad with maple dressing, and maybe a large pitcher of refreshing iced tea lemonade to share.
Psalm 19 says the heavens declare the glory of God. Later in the evening, you could invite everyone to take a few quiet minutes to look up at the stars and reflect on how spending time in creation reminds us of both His power and His personal care. Before they leave, say a short prayer for their family, thank God for His creation and the time together, and send them home with leftovers if there are any, so tomorrow’s lunch feels like a small extension of tonight’s care.
Add chicken broccoli alfredo casserole to your meal plan when you need something easy, filling, and perfect for gathering people together. If you have any questions about making this recipe, feel free to ask in the comments below. I’m here to help! You can also snap a photo and tag @intentionalhospitality on Instagram.💛 I love seeing your creations!
Chicken Broccoli Alfredo Casserole (Easy & Creamy)
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Ingredients
- 1/3 cup onion, diced small
- 2 teaspoons olive oil
- 1 tablespoon minced garlic
- 15 ounces alfredo sauce, Rao’s or your favorite brand
- 1/2 teaspoon poultry seasoning
- 1/2 teaspoon ground thyme
- 1 teaspoon Lawry’s seasoning salt
- 1/2 teaspoon black pepper, or more, to taste
- 1/2 cup sour cream
- 6 cups chicken breast, cooked, diced
- 6 cups broccoli florets, or a little more if you prefer
- 1 1/2 cups grated Swiss cheese, divided into one cup and a 1/2 cup
- 1/2 cup grated Parmesan Cheese
Instructions
Prep the Oven and Dish
- Preheat the oven to 375 degree Fahrenheit/190 degree Celsius.
- Spray a 9 inch x 13 inch casserole dish with olive oil or non-stick spray.2 teaspoons olive oil
Cook the Onion and Garlic
- Heat the olive oil in a large 12 inch cast iron skillet over medium-high heat.
- Add the diced onion and cook until they become transparent and soft. (2 to 3 minutes)1/3 cup onion
- Add the minced garlic and cook until fragrant for about 1 minute.1 tablespoon minced garlic
Make the Alfredo Sauce Mixture
- Next stir in the Alfredo sauce, poultry seasoning, ground thyme, Lawry’s seasoning, black pepper, and sour cream until everything is smooth and well combined.15 ounces alfredo sauce, 1/2 teaspoon poultry seasoning, 1/2 teaspoon ground thyme, 1 teaspoon Lawry’s seasoning salt, 1/2 teaspoon black pepper, 1/2 cup sour cream
- Reduce the heat to low and let the mixture start to simmer for 3 to 4 minutes.
Simmer the Chicken
- Add the cooked, diced chicken breast to the sauce mixture.6 cups chicken breast
- Simmer for about 5 minutes stirring a few times so it does not stick.
Prep the Broccoli
- Cut the broccoli into bite-sized pieces.6 cups broccoli florets
- Place the broccoli in a bowl with 1/2 cup of water.
- Cover tightly with plastic wrap and microwave until hot and slightly tender, depending on how cooked you like your broccoli.
- Drain the broccoli.
Combine and Add Cheese
- Gently stir the broccoli into the chicken and sauce mixture.
- Add 1 cup of grated Swiss cheese and gently mix until it’s melted and evenly distributed.1 1/2 cups grated Swiss cheese
Assemble the Casserole
- Transfer the chicken-broccoli-sauce mixture to the prepared casserole dish.
- Top with the remaining Swiss cheese and the Parmesan cheese.1/2 cup grated Parmesan Cheese
Bake and Serve
- Bake until the casserole is bubbling hot and starting to brown on top.
- Serve hot
Gina’s Notes and Tips
- Storage: Keep leftovers in an airtight container in the refrigerator for up to 4 days.
- Freezing: Assemble the casserole, but do not bake. Cover tightly and freeze for up to 3 months. Thaw overnight in the refrigerator before baking.
- Reheating: Cover and reheat in a 350°F oven until warmed through. For smaller portions, microwave in short intervals until hot.
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