Chicken Broccoli Alfredo Casserole

Chicken broccoli Alfredo casserole brings together tender chicken, broccoli florets, a seasoned Alfredo sauce, and two kinds of cheese in one bubbling baked dish. The sauce begins with onion and garlic, then gets extra seasoning and sour cream before the chicken and broccoli are folded in.

Using cooked chicken keeps the preparation practical, while a jar of Rao’s Alfredo Sauce helps the casserole come together without making a separate sauce from scratch. The finished mixture is transferred to a casserole dish, covered with Swiss and Parmesan cheese, and baked until hot and beginning to brown on top.

The recipe takes about 20 minutes to prepare and 25 minutes to cook, with the oven set to 375°F/190°C. The broccoli is briefly microwaved before it is added, so its doneness can be adjusted before the casserole goes into the oven.

Serve the casserole hot, while the sauce is bubbling and the cheese topping is lightly browned. It is also suitable for keeping in the refrigerator for several days, and it can be frozen, thawed, and reheated, with the understanding that the broccoli will become somewhat softer.

Ingredients

• 1 small onion, diced small

• 2 tsp. olive oil

• 1 T minced garlic

• one 15 oz. jar Rao’s Alfredo Sauce (see notes)

• 1/2 tsp. poultry seasoning

• 1/2 tsp. ground thyme

• 1 tsp. Spike Seasoning

• 1/4 tsp. black pepper (or more, to taste)

• 1/2 cup sour cream

• 6 cups cooked, diced chicken breast (see notes)

• 6 cups broccoli florets (or a little more)

• 1 1/2 cups grated Swiss cheese

• 1/2 cup grated Parmesan Cheese

The ingredient list combines a prepared Alfredo sauce with aromatics, seasonings, cooked chicken, broccoli, sour cream, and a two-cheese topping. The onion is diced small so it cooks in the olive oil before the garlic is added. The recipe uses one 15-ounce jar of Rao’s Alfredo Sauce; the notes also mention that you can make your own sauce or use a different sauce.

The chicken should already be cooked and diced before it is added to the sauce. The recipe notes specifically mention rotisserie chicken as an easy option, while chicken breasts cooked yourself can also be used. Broccoli florets are cut into bite-sized pieces before they are briefly microwaved. The cheese is divided during assembly: 1 cup of the grated Swiss is stirred into the chicken mixture, and the remaining Swiss is used with the Parmesan on top.

How to Make Chicken Broccoli Alfredo Casserole

Begin by preheating the oven to 375°F/190°C. Spray a 9-inch by 13-inch casserole dish with olive oil or nonstick spray so it is ready when the filling is mixed. A large frying pan is important here because it needs to hold the sauce, chicken, and broccoli mixture. A bowl or large 8-quart glass measuring cup can be used for the broccoli.

1. Dice the small onion. Heat the olive oil in the large frying pan over medium-high heat, then cook the onion until it is starting to slightly brown.

2. Add the minced garlic and cook for 1–2 minutes more.

3. Add the Alfredo sauce, poultry seasoning, ground thyme, Spike Seasoning, black pepper, and sour cream to the pan. Stir everything together, then let the mixture begin to simmer over low heat.

4. Cut up the cooked rotisserie chicken or cooked chicken breasts and add the chicken to the sauce. Simmer for about 5 minutes.

5. Cut the broccoli into bite-sized pieces. Put it in a bowl or large 8-quart glass measuring cup and microwave it for 1–2 minutes, depending on how cooked you like it.

6. Gently stir the cooked broccoli into the chicken and sauce mixture.

7. Add 1 cup of the grated Swiss cheese and gently mix it in.

8. Transfer the chicken, broccoli, and sauce mixture to the prepared casserole dish.

9. Top the casserole with the remaining Swiss cheese and the grated Parmesan cheese.

10. Bake for 25–30 minutes, or until the mixture is bubbling hot and beginning to brown on top.

11. Serve hot.

The cooking sequence keeps the onion and garlic separate from the later sauce mixture: the onion first develops slight browning, the garlic follows briefly, and the sauce and seasonings are then added. The broccoli is handled separately before it is folded into the pan, which lets you choose its microwave cooking time before the final bake.

About Chicken Broccoli Alfredo Casserole

This chicken broccoli Alfredo casserole was developed as an easy dinner using purchased rotisserie chicken and Rao’s Alfredo Sauce. Those ready-to-use ingredients reduce the amount of cooking needed before the casserole is assembled, while the onion, garlic, seasonings, sour cream, and cheese add the recipe’s additional components.

The dish is also described as a tasty low-carb dinner. Its preparation moves from stovetop cooking to a short microwave step and then to the oven, making the casserole a practical way to bring the cooked chicken and broccoli together in a bubbling, cheese-topped bake. For another recipe idea, explore Best Ever Tater Tot Casserole. For more inspiration, see Baked Tortellini (Tomato & Meat Sauce).

Variations

The recipe notes allow flexibility in the two ingredients that do the most to streamline preparation. Instead of purchased Rao’s Alfredo Sauce, you can make your own sauce or use a different sauce. The recipe does not provide an alternate sauce formula, so the amount and preparation of any homemade or different sauce should follow the sauce you choose. You can also browse Cheesy Ground Beef and Rice Casserole for another option.

For the chicken, use purchased rotisserie chicken or chicken breasts cooked yourself. In either case, the chicken is cut up before it is added to the sauce mixture. The ingredient list calls for 6 cups of cooked, diced chicken breast, keeping the chicken preparation consistent whichever option you select.

Storage and Make-Ahead

The casserole will keep in the refrigerator for several days. The supported storage guidance does not specify a separate cooling period, container, or reheating time, so the key point is simply to refrigerate it and use it within several days. For another make-ahead idea, see Creamy Chicken Tortilla Soup.

It can also be frozen, thawed, and reheated. The texture changes slightly after freezing: the broccoli becomes a little softer. That softer broccoli is the main difference noted for the frozen and reheated version; the recipe still describes the casserole as not bad after this process.

Why You’ll Love It

The strongest practical appeal of this chicken broccoli Alfredo casserole is how it uses several ready-to-assemble elements without leaving the dish plain. Rotisserie chicken and jarred Alfredo sauce shorten the preparation, while diced onion, minced garlic, seasonings, sour cream, broccoli, Swiss cheese, and Parmesan build the casserole around them. For more inspiration, see Slow Cooker Sausage and Potato Casserole.

The recipe also keeps the process focused. The onion and garlic are cooked in one large pan, the chicken warms in the seasoned sauce, and the broccoli receives a short microwave step before everything moves to the casserole dish. The final bake brings the components together under a cheese topping, and the dish is served hot.

Pro Tips for Success

A few handling details make the sequence easier to manage and help preserve the intended texture. Use a large frying pan rather than a small one, since the pan must eventually hold the sauce, chicken, and broccoli mixture. Have the 9-inch by 13-inch casserole dish prepared before the filling is ready so it can be transferred without delay. For another recipe idea, explore 5-Ingredient Ground Beef Casserole With Potatoes (No Fuss).

• Cook the diced onion over medium-high heat until it is starting to slightly brown before adding the garlic.

• Cook the minced garlic for only 1–2 minutes before adding the sauce mixture.

• Once the Alfredo sauce, seasonings, and sour cream are in the pan, lower the heat and let the mixture begin to simmer.

• Simmer the chicken in the sauce for about 5 minutes before adding the broccoli.

• Cut the broccoli into bite-sized pieces and microwave it for 1–2 minutes, adjusting that time according to how cooked you like it.

• Stir the broccoli and the first cup of Swiss cheese gently into the sauce mixture.

• Judge the finished bake by its visual cues: it should be bubbling hot and beginning to brown on top.

These details preserve the recipe’s order without asking the broccoli or cheese to withstand unnecessary vigorous stirring. The cheese topping is added only after the mixture reaches the casserole dish.

Flavor and Texture

The casserole centers on a creamy Alfredo-based mixture with chicken and broccoli distributed throughout. Onion and garlic are cooked before the sauce is added, while poultry seasoning, ground thyme, Spike Seasoning, and black pepper season the sauce. Sour cream is stirred into that mixture, and Swiss cheese is mixed into the filling before more Swiss and Parmesan are added on top. You can also browse Cream Cheese Fruit Dip – Easy 4-Ingredient Recipe for another option.

The broccoli’s texture can be adjusted before assembly because it is microwaved for 1–2 minutes according to how cooked you like it. After the final bake, the casserole is ready when it is bubbling hot and beginning to brown on top. That cue describes both the heated filling and the browned cheese surface rather than relying on a fixed appearance alone.

The finished dish combines the softer, sauced chicken and broccoli mixture with a melted cheese topping. If the casserole is frozen, thawed, and reheated, the broccoli becomes a little softer. The recipe therefore has a different broccoli texture after freezing than when it is served from the initial bake.

Troubleshooting

The recipe includes a few points where the result can vary, along with the supported way to handle them. Another recipe you may want to try is Hamburger Potato Casserole.

• The broccoli is not as cooked as you prefer: Microwave the bite-sized florets for 1–2 minutes, choosing the time according to how cooked you like the broccoli before it is stirred into the sauce.

• The casserole is not ready at the first check: Continue baking until the mixture is bubbling hot and starting to brown on top. The stated baking window is 25–30 minutes.

• The broccoli is softer after storage: Freezing, thawing, and reheating can make the broccoli a little softer. This is the texture change specifically noted for the frozen version.

• The pan feels crowded while mixing: Use the large frying pan specified for the recipe; it needs to hold all the sauce, chicken, and broccoli ingredients before transfer to the casserole dish.

These adjustments stay within the recipe’s stated cues rather than adding new cooking temperatures or unlisted techniques.

Frequently Asked Questions

What is the best way to prepare chicken broccoli Alfredo casserole?

Cook the diced onion in olive oil until it starts to brown, cook the garlic for 1–2 minutes, then add the Alfredo sauce, seasonings, and sour cream. Simmer the chicken in the sauce for about 5 minutes, microwave the bite-sized broccoli for 1–2 minutes, and gently stir the broccoli and 1 cup of Swiss cheese into the mixture before baking it with the remaining cheese and Parmesan.

How do I know when chicken broccoli Alfredo casserole is ready?

Bake until the mixture is bubbling hot and beginning to brown on top. The recipe gives a baking time of 25–30 minutes.

What temperature should I use?

Preheat the oven to 375°F/190°C.

How long does it take to make?

The listed preparation time is 20 minutes, and the listed cooking time is 25 minutes, for a total time of 45 minutes. The baking instruction allows 25–30 minutes, depending on when the casserole becomes bubbling hot and starts to brown.

What equipment do I need?

Use a 9-inch by 13-inch casserole dish, a large frying pan, and a measuring cup or bowl. The broccoli can be placed in a bowl or a large 8-quart glass measuring cup for microwaving.

How should I store it?

It will keep in the refrigerator for several days.

Can I freeze it?

Yes. It can be frozen, thawed, and reheated, although the broccoli will become a little softer.

Nutrition

Nutrition per serving:

• 24 grams fat

• 4.1 grams fiber

• 3.6 grams sugar

• 807 milligrams sodium

• 45.6 grams protein

• 449 calories

• 166 milligrams cholesterol

• 1 serving

• 12.5 grams saturated fat

• 13.7 grams carbohydrates

• serving size: 1

• calories: 449 calories

• fat: 24 grams fat

• saturated fat: 12.5 grams saturated fat

• carbohydrates: 13.7 grams carbohydrates

• fiber: 4.1 grams fiber

• sugar: 3.6 grams sugar

• protein: 45.6 grams protein

• sodium: 807 milligrams sodium

• cholesterol: 166 milligrams cholesterol