Chicken Broccoli Alfredo Casserole (Easy & Creamy)
This chicken broccoli Alfredo casserole is a creamy, hearty dinner made with cooked chicken breast, bite-sized broccoli, Alfredo sauce, sour cream, Swiss cheese, and Parmesan. The sauce bakes thick and smooth with a lightly golden top, creating a filling casserole that's ready in about 45 minutes. It’s perfect for family dinners, potlucks, or feeding a larger group with minimal effort.
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 for 25 minutes, or until the casserole is bubbling hot and starting to brown on top. Time can vary by a few minutes depending on your oven and how warm the mixture was going in.
- Serve hot
Notes
This Chicken Broccoli Alfredo Casserole reheats beautifully and stays creamy the next day.
- 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.
Nutrition
Serving: 1serving | Calories: 395kcal | Carbohydrates: 9g | Protein: 35g | Fat: 24g | Saturated Fat: 11g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 6g | Trans Fat: 0.01g | Cholesterol: 140mg | Sodium: 953mg | Potassium: 693mg | Fiber: 2g | Sugar: 3g | Vitamin A: 777IU | Vitamin C: 63mg | Calcium: 294mg | Iron: 1mg
