Low Carb Chicken Casserole – Cozy, Creamy, and Weeknight Friendly

This low carb chicken casserole is the kind of weeknight dinner that makes life easier. It’s rich, cheesy, and comforting without weighing you down. You get tender chicken, plenty of vegetables, and a creamy sauce that ties everything together.

It’s simple to prep, flexible with what you have on hand, and perfect for family-style eating. If you love a hearty bake that fits a low-carb lifestyle, this one will quickly become a go-to.

Print Recipe

Low Carb Chicken Casserole - Cozy, Creamy, and Weeknight Friendly

Prep Time15 minutes mins

Cook Time30 minutes mins

Total Time45 minutes mins

Servings: 6 servings

Ingredients

• 3 cups cooked chicken, shredded or diced (rotisserie works great)
• 2 cups small broccoli florets
• 1 small head cauliflower, cut into small florets (about 4 cups)
• 1 small zucchini, chopped
• 1/2 small red onion, thinly sliced
• 2 cloves garlic, minced
• 1 cup full-fat sour cream
• 4 oz cream cheese, softened
• 1/2 cup heavy cream (or unsweetened almond milk for a lighter option)
• 1 1/2 cups shredded cheddar cheese, divided
• 1/2 cup grated Parmesan cheese
• 2 tbsp olive oil or butter
• 1 tsp smoked paprika (or sweet paprika)
• 1/2 tsp dried thyme
• 1/2 tsp garlic powder
• Salt and black pepper to taste
• Optional: 1/4 tsp crushed red pepper flakes for a little heat
• Optional topping: 1/4 cup crushed pork rinds or almond flour for extra crunch

Instructions

• Preheat and prep: Heat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with olive oil or butter.
• Par-cook the vegetables: Toss the broccoli and cauliflower with 1 tbsp olive oil, salt, and pepper. Spread on a sheet pan and roast for 10–12 minutes until just tender. This keeps the casserole from getting watery.
• Sauté aromatics: In a skillet over medium heat, warm the remaining 1 tbsp olive oil. Add the red onion and cook 3–4 minutes until softened. Stir in the minced garlic and cook 30 seconds until fragrant.
• Make the creamy base: In a large bowl, whisk together sour cream, cream cheese, and heavy cream until smooth. Add paprika, thyme, garlic powder, red pepper flakes (if using), 1 cup cheddar, and the Parmesan. Season with salt and pepper.
• Combine: Add the cooked chicken, roasted broccoli and cauliflower, sautéed onions and garlic, and the chopped zucchini to the bowl. Stir until everything is evenly coated.
• Assemble: Transfer the mixture to the prepared baking dish. Spread in an even layer. Sprinkle the remaining 1/2 cup cheddar on top. If using, scatter crushed pork rinds or almond flour over the cheese for a crunchy finish.
• Bake: Bake for 20–25 minutes, until the casserole is bubbling around the edges and the top is golden.
• Rest and serve: Let it sit for 5–10 minutes before serving so it sets slightly. Taste and adjust salt and pepper if needed.

Why This Recipe Works

• Balanced textures: Juicy chicken, crisp-tender vegetables, and a creamy sauce create a satisfying mix without bread or pasta.
• Easy shortcuts: Using rotisserie chicken or leftover cooked chicken cuts the time in half without sacrificing flavor.
• Flavor-packed but light: Garlic, onion, and a little paprika add depth while keeping carbs low.
• One-pan convenience: Everything bakes together for easy cleanup and a hands-off finish.
• Meal-prep friendly: It reheats well and freezes nicely, so you can plan ahead.

Ingredients

• 3 cups cooked chicken, shredded or diced (rotisserie works great)
• 2 cups small broccoli florets
• 1 small head cauliflower, cut into small florets (about 4 cups)
• 1 small zucchini, chopped
• 1/2 small red onion, thinly sliced
• 2 cloves garlic, minced
• 1 cup full-fat sour cream
• 4 oz cream cheese, softened
• 1/2 cup heavy cream (or unsweetened almond milk for a lighter option)
• 1 1/2 cups shredded cheddar cheese, divided
• 1/2 cup grated Parmesan cheese
• 2 tbsp olive oil or butter
• 1 tsp smoked paprika (or sweet paprika)
• 1/2 tsp dried thyme
• 1/2 tsp garlic powder
• Salt and black pepper to taste
• Optional: 1/4 tsp crushed red pepper flakes for a little heat
• Optional topping: 1/4 cup crushed pork rinds or almond flour for extra crunch

Instructions

1. Preheat and prep: Heat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with olive oil or butter.
2. Par-cook the vegetables: Toss the broccoli and cauliflower with 1 tbsp olive oil, salt, and pepper.

   Spread on a sheet pan and roast for 10–12 minutes until just tender. This keeps the casserole from getting watery.

3. Sauté aromatics: In a skillet over medium heat, warm the remaining 1 tbsp olive oil. Add the red onion and cook 3–4 minutes until softened.

   Stir in the minced garlic and cook 30 seconds until fragrant.

4. Make the creamy base: In a large bowl, whisk together sour cream, cream cheese, and heavy cream until smooth. Add paprika, thyme, garlic powder, red pepper flakes (if using), 1 cup cheddar, and the Parmesan. Season with salt and pepper.
5. Combine: Add the cooked chicken, roasted broccoli and cauliflower, sautéed onions and garlic, and the chopped zucchini to the bowl.

   Stir until everything is evenly coated.

6. Assemble: Transfer the mixture to the prepared baking dish. Spread in an even layer. Sprinkle the remaining 1/2 cup cheddar on top.

   If using, scatter crushed pork rinds or almond flour over the cheese for a crunchy finish.

7. Bake: Bake for 20–25 minutes, until the casserole is bubbling around the edges and the top is golden.
8. Rest and serve: Let it sit for 5–10 minutes before serving so it sets slightly. Taste and adjust salt and pepper if needed.

How to Store

• Refrigerate: Cool completely, then cover tightly. Store for up to 4 days.
• Reheat: Warm individual portions in the microwave for 1–2 minutes, or reheat in a 325°F (165°C) oven until hot.
• Freeze: Portion into airtight containers and freeze for up to 2 months.

  Thaw overnight in the fridge before reheating.

• Make-ahead: Assemble up to the baking step, cover, and refrigerate for 24 hours. Bake when ready, adding 5–10 minutes to the time.

Health Benefits

• Low in carbs, high in protein: Chicken and cheese provide steady energy and support satiety, helping tame cravings.
• Veggie-forward: Broccoli and cauliflower bring fiber, vitamin C, and antioxidants without the starch of pasta or rice.
• Healthy fats: Full-fat dairy can improve flavor and fullness, which may help with portion control.
• Gluten-free by default: There’s no flour or breadcrumbs, making it a simple choice for gluten-free eaters.

Common Mistakes to Avoid

• Skipping the pre-roast: Raw cauliflower and broccoli release water as they bake, making the casserole soupy. Par-cooking is key.
• Overcooking the chicken: Use cooked chicken that’s still moist.

  If you cook it from raw, avoid drying it out before it goes into the sauce.

• Not seasoning enough: Taste the sauce before mixing. A pinch more salt or paprika can make a big difference.
• Using too much liquid: Stick to the amounts listed. Thin liquids (like milk) can make the casserole runny.
• Skipping the rest: Letting it sit after baking helps it set and makes serving cleaner.

Recipe Variations

• Buffalo style: Add 2–3 tbsp buffalo sauce to the creamy base and top with blue cheese crumbles and chopped green onions.
• Green chile chicken: Stir in a small can of diced green chiles and swap cheddar for pepper jack.
• Spinach artichoke: Fold in 2 cups fresh spinach (lightly wilted) and 1 cup chopped artichoke hearts.

  Use mozzarella and Parmesan.

• Mushroom and bacon: Sauté sliced mushrooms until browned and crisp 3 slices of bacon. Fold in with the chicken and veg.
• Dairy-light: Use Greek yogurt instead of sour cream and reduce the cheese by 1/2 cup. It’ll still be creamy.
• Keto boost: Add diced avocado on top after baking and drizzle with a little olive oil for extra healthy fats.

FAQ

Can I use raw chicken instead of cooked?

Yes, but cook it first.

Dice or slice boneless chicken, season it, and sauté until just cooked through. Let it cool slightly before mixing into the sauce.

What can I use instead of cauliflower?

Chopped cabbage, riced cauliflower, or additional broccoli all work. Keep pieces small and par-cook to avoid excess moisture.

Is there a dairy-free option?

You can try full-fat coconut milk and a dairy-free cream cheese alternative.

Use a dairy-free shredded cheese or skip the cheese and add extra seasoning for flavor.

How do I keep the casserole from getting watery?

Roast the vegetables first, don’t overdo the liquids, and let the casserole rest after baking. If your zucchini is very watery, pat it dry before adding.

Can I make this spicy?

Absolutely. Add red pepper flakes, a spoonful of harissa, or a drizzle of hot sauce to the creamy base.

Pepper jack cheese also adds a gentle kick.

What side dishes pair well with this?

A simple green salad, sautéed green beans, roasted asparagus, or a crunchy slaw keep the meal light and balanced.

How many carbs are in a serving?

Exact numbers depend on brands and portions, but a typical serving lands around 6–9 net carbs. For accuracy, plug ingredients into a nutrition calculator.

Final Thoughts

This low carb chicken casserole brings comfort food vibes without the carb overload. It’s flexible, forgiving, and easy to tailor to your taste.

With a creamy sauce, tender chicken, and lots of vegetables, it checks every box for a cozy, reliable dinner. Keep it in your weeknight rotation and switch up the add-ins to keep it fresh. Once you make it, you’ll see why it’s an instant classic.