Creamy, cheesy, and incredibly satisfying, this Keto Chicken Alfredo Casserole recipe is everything you want in a comfort food dinner without the extra carbs.

Juicy chicken, tender broccoli, rich Alfredo sauce, and plenty of melted cheese bake together into a hearty casserole that’s full of flavor. It’s the kind of meal that feels indulgent while still fitting perfectly into a low-carb lifestyle.

Keto Chicken Alfredo Casserole skips the traditional pasta and replaces it with low-carb ingredients like broccoli and cauliflower, allowing the creamy Alfredo sauce and tender chicken to shine. Every bite is loaded with garlic, Parmesan, mozzarella, and perfectly seasoned chicken. It’s naturally high in protein, keto-friendly, gluten-free, and ideal for meal prep because it reheats beautifully throughout the week.

I make Keto Chicken Alfredo Casserole when I’m craving something rich and comforting but don’t want a heavy pasta dinner. Rotisserie chicken makes it incredibly easy, and I usually add extra broccoli because it tastes amazing with the creamy Alfredo sauce. Even people who aren’t following a keto diet always ask for seconds.

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Why You’ll Love This Recipe

• Ready in about 45 minutes.
• Naturally low in carbs and keto-friendly.
• Packed with protein and healthy fats.
• Rich, creamy, and loaded with cheese.
• Perfect for meal prep and leftovers.
• Made in one baking dish for easy cleanup.
• Gluten-free with simple ingredients.
• Family-friendly and beginner-friendly.

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Ingredients You’ll Need

For the Casserole

• 2 cups cooked chicken, shredded or diced – Chicken provides lean protein and makes the casserole hearty. Rotisserie chicken is a great shortcut.
• 3 cups broccoli florets – Broccoli adds texture, color, and fiber while keeping the casserole low in carbs. Steam it lightly before baking.
• 2 cups cauliflower florets – Cauliflower replaces pasta while soaking up the creamy Alfredo sauce beautifully.
• 2 cups Alfredo sauce – Alfredo sauce creates the rich, creamy base. Choose a low-carb Alfredo sauce or make your own.
• 1½ cups shredded mozzarella cheese – Mozzarella melts beautifully and creates a gooey, cheesy topping.
• 1 cup grated Parmesan cheese, divided – Parmesan adds bold, savory flavor and helps create a golden crust.
• 4 ounces cream cheese, softened – Cream cheese makes the sauce even richer and creamier.
• 2 garlic cloves, minced – Fresh garlic adds plenty of savory flavor.
• 1 teaspoon Italian seasoning – Italian seasoning complements the creamy Alfredo sauce.
• ½ teaspoon onion powder – Onion powder adds extra depth of flavor.
• ½ teaspoon salt – Salt enhances the flavors. Adjust according to the saltiness of your Alfredo sauce.
• ¼ teaspoon black pepper – Black pepper balances the richness.
• 2 tablespoons chopped fresh parsley – Fresh parsley adds color and freshness before serving.

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Kitchen Tools You’ll Need

• 9×13-inch baking dish
• Large mixing bowl
• Medium saucepan
• Cutting board
• Sharp knife
• Measuring cups and spoons
• Mixing spoon
• Aluminum foil

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How to Make Keto Chicken Alfredo Casserole

Step 1: Preheat the oven

Preheat your oven to 375°F (190°C).

Lightly grease a 9×13-inch baking dish with butter or cooking spray.

Step 2: Prepare the vegetables

Steam the broccoli and cauliflower for 3 to 4 minutes until they’re slightly tender.

Drain well to remove excess moisture.

Step 3: Make the Alfredo mixture

In a large bowl, combine the Alfredo sauce, softened cream cheese, garlic, Italian seasoning, onion powder, salt, black pepper, and ½ cup Parmesan cheese.

Mix until smooth.

Step 4: Assemble the casserole

Add the chicken, broccoli, and cauliflower to the Alfredo mixture.

Stir until everything is evenly coated.

Transfer the mixture to the prepared baking dish.

Top with the mozzarella cheese and remaining Parmesan cheese.

Step 5: Bake

Cover loosely with aluminum foil and bake for 20 minutes.

Remove the foil and bake for another 10 to 15 minutes, or until the cheese is melted, bubbly, and lightly golden.

Step 6: Serve

Let the casserole rest for 5 to 10 minutes before serving.

Sprinkle with chopped parsley and enjoy while warm.

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Recipe Variations

Keto Chicken Alfredo Casserole with Spinach

Add 2 cups fresh spinach to the casserole before baking for extra nutrients and color.

Bacon Keto Chicken Alfredo Casserole

Mix in crumbled cooked bacon for smoky flavor and added richness.

Mushroom Keto Chicken Alfredo Casserole

Add 1 cup sautéed mushrooms for an earthy flavor that pairs perfectly with Alfredo sauce.

Spicy Keto Chicken Alfredo Casserole

Stir in crushed red pepper flakes or diced jalapeños for a little heat.

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What to Serve With Keto Chicken Alfredo Casserole

• Caesar salad
• Roasted asparagus
• Garlic green beans
• Sautéed spinach
• Roasted Brussels sprouts
• Zucchini noodles
• Cucumber salad
• Roasted mushrooms
• Keto garlic bread
• Fresh avocado slices

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How to Store and Reheat

Refrigerator

Store leftover Keto Chicken Alfredo Casserole in an airtight container in the refrigerator for up to 4 days.

Freezer

Freeze the fully baked casserole in a freezer-safe container for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheating

Reheat individual portions in the microwave until hot, or warm the casserole in a 350°F (175°C) oven for about 20 minutes. If the sauce thickens after storing, stir in a splash of heavy cream before reheating.

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Common Mistakes to Avoid

Not draining the vegetables

Broccoli and cauliflower release moisture after steaming. Drain them well before adding them to the casserole so the sauce stays rich and creamy.

Overcooking the vegetables

Steam the vegetables only until they’re slightly tender. They’ll continue cooking while the casserole bakes.

Using a sugary Alfredo sauce

Some store-bought Alfredo sauces contain added sugars. Choose a low-carb Alfredo sauce or make your own to keep the recipe keto-friendly.

Skipping the resting time

Allow the casserole to rest for 5 to 10 minutes before serving. This helps the sauce thicken and makes the casserole easier to scoop.

Overbaking the casserole

Bake only until the cheese is melted and golden. Overbaking can dry out the chicken and make the vegetables too soft.

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Frequently Asked Questions

Is Keto Chicken Alfredo Casserole really low carb?

Yes. Keto Chicken Alfredo Casserole replaces traditional pasta with low-carb vegetables like broccoli and cauliflower, making it suitable for a keto lifestyle.

Can I use rotisserie chicken?

Absolutely. Rotisserie chicken is a great shortcut that saves time and adds plenty of flavor.

Can I make Keto Chicken Alfredo Casserole ahead of time?

Yes. Assemble the casserole, cover it tightly, and refrigerate it for up to 24 hours before baking.

Can I freeze Keto Chicken Alfredo Casserole?

Yes. Bake it first, let it cool completely, then freeze it for up to 3 months. Thaw overnight in the refrigerator before reheating.

What other low-carb vegetables can I add?

Try zucchini, spinach, mushrooms, asparagus, kale, cabbage, green beans, or Brussels sprouts for even more flavor and variety.