Keto Chicken Casserole – Creamy, Comforting, and Low-Carb

This keto chicken casserole is the kind of weeknight dinner that makes life easier. It’s creamy, cheesy, and loaded with tender chicken and low-carb veggies—without feeling heavy or fussy. Everything bakes together into a bubbly, golden dish that tastes like comfort food but fits your goals.

Whether you’re cooking for family or meal prepping for the week, this casserole checks all the boxes. It’s simple to assemble, reheats beautifully, and you won’t miss the pasta or rice one bit.

Save

Keto Chicken Casserole - Creamy, Comforting, and Low-Carb

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 6 servings

Ingredients Method

Ingredients

  

• 3 cups cooked chicken, shredded or cubed (rotisserie chicken works great)
• 2 cups broccoli florets, lightly steamed or blanched
• 1 cup cauliflower florets, lightly steamed or riced
• 1 small zucchini, diced (optional for extra veg)
• 1/2 small yellow onion, finely chopped
• 2 cloves garlic, minced
• 4 oz cream cheese, softened
• 1/2 cup sour cream
• 1/3 cup mayonnaise
• 1/2 cup heavy cream
• 1 1/2 cups shredded cheddar cheese, divided
• 1/2 cup shredded mozzarella or Monterey Jack
• 2 tbsp grated Parmesan
• 2 tbsp olive oil or butter
• 1 tsp Dijon mustard
• 1 tsp smoked paprika
• 1/2 tsp dried thyme or Italian seasoning
• 1/4 tsp red pepper flakes (optional)
• Salt and black pepper, to taste
• Fresh parsley or chives, chopped, for garnish

Method

 

1. Preheat and prep: Heat your oven to 375°F (190°C). Lightly grease a 9x13-inch casserole dish.
2. Par-cook the veggies: Steam or blanch the broccoli and cauliflower until just tender-crisp, about 3–4 minutes. Drain well to remove excess moisture.
3. Sauté aromatics: In a skillet, warm olive oil or butter over medium heat. Add onion and cook until soft, 3–4 minutes. Stir in garlic for 30 seconds until fragrant. Remove from heat.
4. Make the creamy base: In a large bowl, whisk together cream cheese, sour cream, mayonnaise, and heavy cream until smooth. Stir in Dijon, smoked paprika, thyme, red pepper flakes, 1 cup cheddar, mozzarella, and Parmesan. Season with salt and pepper.
5. Combine the filling: Fold in the chicken, sautéed onion and garlic, broccoli, cauliflower, and zucchini. Mix until everything is evenly coated.
6. Assemble: Spread the mixture in the prepared casserole dish. Top with the remaining 1/2 cup cheddar.
7. Bake: Bake uncovered for 20–25 minutes, until the casserole is bubbling and the top is golden.
8. Rest and garnish: Let it rest for 5–10 minutes to set. Sprinkle with chopped parsley or chives before serving.

Why This Recipe Works

Save

• Low-carb, high-satiety: Chicken, cheese, and non-starchy vegetables create a filling meal that keeps carbs in check.
• One-dish convenience: The entire meal bakes in a single casserole dish, making cleanup easy.
• Customizable: Swap veggies, cheeses, or seasonings depending on what you have on hand.
• Great texture balance: Creamy sauce, tender chicken, and a golden, slightly crisp cheese top.
• Meal prep friendly: Stores and reheats well without losing flavor or texture.

Ingredients

• 3 cups cooked chicken, shredded or cubed (rotisserie chicken works great)
• 2 cups broccoli florets, lightly steamed or blanched
• 1 cup cauliflower florets, lightly steamed or riced
• 1 small zucchini, diced (optional for extra veg)
• 1/2 small yellow onion, finely chopped
• 2 cloves garlic, minced
• 4 oz cream cheese, softened
• 1/2 cup sour cream
• 1/3 cup mayonnaise
• 1/2 cup heavy cream
• 1 1/2 cups shredded cheddar cheese, divided
• 1/2 cup shredded mozzarella or Monterey Jack
• 2 tbsp grated Parmesan
• 2 tbsp olive oil or butter
• 1 tsp Dijon mustard
• 1 tsp smoked paprika
• 1/2 tsp dried thyme or Italian seasoning
• 1/4 tsp red pepper flakes (optional)
• Salt and black pepper, to taste
• Fresh parsley or chives, chopped, for garnish

Step-by-Step Instructions

Save

1. Preheat and prep: Heat your oven to 375°F (190°C). Lightly grease a 9×13-inch casserole dish.
2. Par-cook the veggies: Steam or blanch the broccoli and cauliflower until just tender-crisp, about 3–4 minutes.

   Drain well to remove excess moisture.

3. Sauté aromatics: In a skillet, warm olive oil or butter over medium heat. Add onion and cook until soft, 3–4 minutes. Stir in garlic for 30 seconds until fragrant.

   Remove from heat.

4. Make the creamy base: In a large bowl, whisk together cream cheese, sour cream, mayonnaise, and heavy cream until smooth. Stir in Dijon, smoked paprika, thyme, red pepper flakes, 1 cup cheddar, mozzarella, and Parmesan. Season with salt and pepper.
5. Combine the filling: Fold in the chicken, sautéed onion and garlic, broccoli, cauliflower, and zucchini.

   Mix until everything is evenly coated.

6. Assemble: Spread the mixture in the prepared casserole dish. Top with the remaining 1/2 cup cheddar.
7. Bake: Bake uncovered for 20–25 minutes, until the casserole is bubbling and the top is golden.
8. Rest and garnish: Let it rest for 5–10 minutes to set. Sprinkle with chopped parsley or chives before serving.

Storage Instructions

• Refrigerator: Cool completely, then cover tightly.

  Store for up to 4 days.

• Freezer: Portion into airtight containers. Freeze for up to 2 months. Thaw overnight in the fridge.
• Reheating: Warm in a 325°F (165°C) oven, covered, for 15–20 minutes, or microwave in short bursts.

  Add a splash of cream if it looks dry.

Save

Benefits of This Recipe

• Keto-friendly: No pasta, rice, or breadcrumbs. Low net carbs with plenty of protein and fat to keep you satisfied.
• Balanced comfort: Creamy, cheesy texture without being heavy or greasy when balanced with vegetables.
• Budget-friendly: Uses leftover or rotisserie chicken and common pantry staples.
• Flexible for families: Mild flavors that kids often like, with optional heat for adults.
• Great for make-ahead: Assemble earlier in the day and bake at dinnertime.

What Not to Do

• Don’t skip draining the veggies: Excess water will thin the sauce and make the casserole soupy.
• Don’t overbake: Baking too long can dry out the chicken and break the sauce. Pull it when it’s bubbly and golden.
• Don’t use low-fat dairy: It can curdle and won’t give the rich, creamy texture you want in a keto dish.
• Don’t forget to season: Taste the sauce and adjust salt and pepper before baking.

  The veggies and chicken need a well-seasoned base.

• Don’t crowd raw, watery vegetables: If adding mushrooms or spinach, sauté first to cook off moisture.

Alternatives

• Veggie swaps: Use asparagus, green beans, spinach (sautéed), or mushrooms (sautéed). Keep total veg around 3–4 cups.
• Cheese variations: Try Gruyère, pepper jack, or Swiss for a different flavor profile. A little blue cheese adds boldness.
• Protein changes: Turkey, shredded pork, or leftover roasted chicken thighs all work.

  For a pescatarian spin, use cooked, flaked salmon.

• Sauce tweaks: Replace Dijon with 1 tsp lemon zest and a squeeze of lemon for brightness, or add 1–2 tsp ranch seasoning for a familiar vibe.
• Topping ideas: Mix extra Parmesan with crushed pork rinds or almond flour for a crunchy top.

FAQ

Can I use raw chicken instead of cooked?

Yes, but cook it first for best texture and food safety. Dice or shred poached, baked, or pan-seared chicken, or use a store-bought rotisserie chicken to save time.

How can I thicken the sauce without flour?

Cream cheese, sour cream, and reduced moisture do the job. Make sure vegetables are well-drained, and let the casserole rest so the sauce sets.

Is this casserole spicy?

It’s mild as written.

For heat, add more red pepper flakes, a diced jalapeño (sautéed), or swap in pepper jack cheese.

What sides go well with this?

A simple green salad with olive oil and vinegar, roasted Brussels sprouts, or sautéed zucchini make great low-carb sides.

Can I make it dairy-free?

It’s challenging since the creaminess relies on dairy. If needed, try full-fat coconut milk with dairy-free cream cheese and a melty dairy-free cheese, but expect a different flavor and texture.

How do I keep the top from over-browning?

If the cheese gets too dark before the center is hot, tent loosely with foil for the last 5–10 minutes.

What’s the best chicken to use?

Rotisserie chicken is convenient and flavorful. Otherwise, use baked or poached chicken breasts or thighs.

Thighs stay especially juicy.

Can I assemble it ahead of time?

Yes. Assemble up to 24 hours in advance, cover, and refrigerate. Add a few minutes to the bake time if it goes into the oven cold.

Wrapping Up

This keto chicken casserole brings all the cozy, cheesy goodness you want from comfort food, without the carb overload.

It’s easy to prep, flexible with ingredients, and perfect for busy nights or make-ahead meals. Keep the basics the same—well-drained veggies, a rich creamy base, and a bubbly golden top—and you’ll have a reliable dinner you can turn to again and again. Enjoy it fresh from the oven, and count on the leftovers to taste just as good tomorrow.