This keto chicken and broccoli casserole is the kind of cozy dinner that makes weeknights feel easy. It’s creamy, cheesy, and satisfying without weighing you down. You get tender chicken, crisp-tender broccoli, and a rich sauce that brings everything together.
Best of all, it comes together with simple ingredients and minimal effort. Make it once, and it’ll quickly become a go-to in your meal rotation.
Keto Chicken and Broccoli Casserole (Creamy & Comforting) - A Weeknight Favorite
Ingredients
- Cooked chicken (about 4 cups shredded or cubed; rotisserie works great)
- Broccoli florets (5–6 cups, fresh or frozen)
- Heavy cream (1 cup)
- Cream cheese (6 oz, softened)
- Cheddar cheese (2 cups shredded, divided)
- Parmesan cheese (1/2 cup grated)
- Butter (2 tbsp)
- Garlic (2–3 cloves, minced) or 1 tsp garlic powder
- Onion powder (1 tsp)
- Dijon mustard (1–2 tsp)
- Chicken broth (1/2 cup, low-sodium)
- Smoked paprika (1/2 tsp)
- Salt and black pepper (to taste)
- Olive oil (1 tbsp, optional for greasing)
Instructions
- Prep the oven and pan. Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish with olive oil or butter.
- Cook the broccoli. Steam or blanch the florets until crisp-tender, about 3–4 minutes fresh or 4–5 minutes from frozen. Drain well and pat dry to avoid a watery casserole.
- Build the sauce base. In a large skillet over medium heat, melt the butter. Add garlic and cook 30 seconds until fragrant.
- Make it creamy. Whisk in heavy cream and chicken broth. Add cream cheese in pieces and stir until fully melted and smooth.
- Season and thicken. Stir in Dijon, onion powder, smoked paprika, 1 cup shredded cheddar, and all the Parmesan. Simmer 2–3 minutes until the sauce slightly thickens. Taste and season with salt and pepper.
- Combine the filling. In a large bowl, mix cooked chicken and broccoli. Pour the sauce over and fold until everything is evenly coated.
- Assemble. Spread the mixture into the prepared baking dish. Top with the remaining 1 cup cheddar.
- Bake. Place in the oven for 18–22 minutes, until bubbly around the edges and the top is melted and lightly golden.
- Rest and serve. Let it rest 5–10 minutes so the sauce sets. Spoon into bowls and season with extra pepper if you like.
Why This Recipe Works
This casserole focuses on flavor and texture without the carbs. Heavy cream, cream cheese, and cheddar build a thick, velvety sauce that clings to the chicken and broccoli. Garlic, onion powder, and Dijon add depth and a gentle kick. Pre-cooking the broccoli keeps it bright and not watery, while pre-cooked chicken speeds up the process. The result is a one-pan meal that feels indulgent but stays keto-friendly.
Shopping List
- Cooked chicken (about 4 cups shredded or cubed; rotisserie works great)
- Broccoli florets (5–6 cups, fresh or frozen)
- Heavy cream (1 cup)
- Cream cheese (6 oz, softened)
- Cheddar cheese (2 cups shredded, divided)
- Parmesan cheese (1/2 cup grated)
- Butter (2 tbsp)
- Garlic (2–3 cloves, minced) or 1 tsp garlic powder
- Onion powder (1 tsp)
- Dijon mustard (1–2 tsp)
- Chicken broth (1/2 cup, low-sodium)
- Smoked paprika (1/2 tsp)
- Salt and black pepper (to taste)
- Olive oil (1 tbsp, optional for greasing)
Step-by-Step Instructions
- Prep the oven and pan. Preheat oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish with olive oil or butter.
- Cook the broccoli. Steam or blanch the florets until crisp-tender, about 3–4 minutes fresh or 4–5 minutes from frozen. Drain well and pat dry to avoid a watery casserole.
- Build the sauce base. In a large skillet over medium heat, melt the butter. Add garlic and cook 30 seconds until fragrant.
- Make it creamy. Whisk in heavy cream and chicken broth.
Add cream cheese in pieces and stir until fully melted and smooth.
- Season and thicken. Stir in Dijon, onion powder, smoked paprika, 1 cup shredded cheddar, and all the Parmesan. Simmer 2–3 minutes until the sauce slightly thickens. Taste and season with salt and pepper.
- Combine the filling. In a large bowl, mix cooked chicken and broccoli.
Pour the sauce over and fold until everything is evenly coated.
- Assemble. Spread the mixture into the prepared baking dish. Top with the remaining 1 cup cheddar.
- Bake. Place in the oven for 18–22 minutes, until bubbly around the edges and the top is melted and lightly golden.
- Rest and serve. Let it rest 5–10 minutes so the sauce sets. Spoon into bowls and season with extra pepper if you like.
Keeping It Fresh
Store leftovers in an airtight container in the fridge for up to 4 days.
Reheat in the oven at 325°F until warmed through, or microwave in short bursts, stirring between intervals. For freezing, cool completely, then wrap tightly and freeze for up to 2 months. Thaw overnight in the fridge and reheat covered to maintain moisture.
If the sauce looks too thick after reheating, stir in a splash of cream or broth.
Why This is Good for You
This casserole is low in carbs and provides a strong balance of protein and healthy fats, which helps keep you full. Broccoli brings fiber, vitamin C, vitamin K, and antioxidants. Cheese and cream offer calcium and make the dish satisfying, reducing the urge to snack later.
Compared to classic casseroles with rice or pasta, this version skips the starch and stays aligned with keto goals.
Common Mistakes to Avoid
- Not draining broccoli well. Excess water will thin the sauce and make the casserole soupy.
- Using cold dairy. Cold cream cheese won’t melt smoothly. Soften it first for a silky sauce.
- Overbaking. Too long in the oven dries out chicken and separates the sauce. Pull it once it’s bubbling and golden.
- Under-seasoning. Taste the sauce before assembling.
Add salt, pepper, and Dijon until it pops.
- Using watery cheeses. Pre-shredded cheese is fine, but avoid low-moisture, low-fat blends that won’t melt well.
Alternatives
- Protein swaps: Use turkey, cooked pork loin, or shredded rotisserie chicken. For a pescatarian twist, try flaked cooked salmon.
- Veggie swaps: Cauliflower florets, green beans, or zucchini (salt and pat dry) work well. Keep the total veggie volume similar.
- Cheese options: Swap cheddar for Gruyère, Monterey Jack, or a mix of provolone and mozzarella for extra melt.
- Flavor boosts: Add cooked bacon or pancetta, a pinch of red pepper flakes, or fresh herbs like parsley or chives.
- Dairy-light version: Use half heavy cream and half unsweetened almond milk, and reduce cheese by 1/2 cup.
Thicken slightly longer on the stove.
- One-pan shortcut: If your skillet is oven-safe, mix everything in it and bake directly to cut down on dishes.
FAQ
Can I use raw chicken instead of cooked?
Yes, but cook it first. Dice or slice raw chicken, season with salt and pepper, and sauté in butter or olive oil until no longer pink. Then proceed with the recipe as written.
Is frozen broccoli okay?
Absolutely.
Thaw, drain, and pat it very dry, then steam briefly to warm through. Removing excess moisture is key for a creamy, not watery, casserole.
How can I make this spicier?
Add 1/2–1 teaspoon red pepper flakes, a dash of hot sauce, or use pepper jack cheese for heat. Smoked paprika can be increased for a deeper, smoky kick.
What if I don’t have cream cheese?
You can use mascarpone or full-fat ricotta (well-drained) as a substitute.
The sauce may be slightly looser, so simmer a bit longer to thicken.
Can I prepare it ahead of time?
Yes. Assemble up to the baking step, cover, and refrigerate for up to 24 hours. When ready, bake covered for 10 minutes, then uncover and bake until bubbly and golden.
How many carbs are in a serving?
Exact numbers vary by brand and portions, but a typical serving lands around 5–7g net carbs.
Check your specific ingredients for precise macros.
What pan size should I use?
A 9×13-inch dish works best. For smaller batches, use an 8×8-inch dish and reduce the bake time by a few minutes.
Can I add eggs to make it more like a breakfast bake?
Yes. Whisk 4–6 eggs into the cooled sauce before combining with chicken and broccoli.
Bake until the center is set, about 25–30 minutes.
In Conclusion
This Keto Chicken and Broccoli Casserole is creamy, comforting, and easy enough for any night of the week. With a rich sauce, tender chicken, and just-right broccoli, it delivers big flavor without the carbs. Keep it classic, or mix it up with the alternatives and add-ins.
Either way, it’s a reliable recipe you’ll turn to again and again.