Keto Chicken Broccoli Casserole – Cozy, Creamy, and Low-Carb
This is the type of weeknight dinner that makes you exhale the moment it hits the table. Creamy, cheesy, and packed with tender chicken and bright green broccoli, this casserole feels like comfort food without the carb crash. It’s simple to make, easy to scale, and keeps well for lunches.
If you’re following keto, it fits right in. If you’re not, you’ll still love it because it just tastes really good.
Ingredients
Method
- Prep the oven and pan: Heat the oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter or oil.
- Par-cook the broccoli: Steam or microwave the broccoli just until crisp-tender, about 3–4 minutes. If using frozen, thaw and pat dry. Excess water will thin your sauce, so drain well.
- Make the creamy base: In a large skillet over medium heat, melt the butter. Add garlic and cook 30 seconds. Stir in cream cheese, heavy cream, and chicken broth. Whisk until smooth and gently bubbling.
- Season the sauce: Add Dijon, onion powder, smoked paprika, 1 teaspoon salt, and 1/2 teaspoon pepper. Simmer 2–3 minutes to thicken slightly.
- Stir in cheeses: Remove from heat. Fold in the cheddar and Parmesan until melted and velvety. Taste and adjust seasoning. A pinch of red pepper flakes adds a nice kick.
- Combine the filling: In a large bowl, mix the cooked chicken and broccoli. Pour the cheese sauce over and toss until everything is evenly coated.
- Assemble and top: Transfer the mixture to the baking dish. Sprinkle the remaining 1/2 cup cheddar over the top for that golden, bubbly finish.
- Bake: Bake 18–22 minutes, until the edges are bubbling and the top is lightly browned. If you want deeper color, broil 1–2 minutes at the end, watching closely.
- Rest and garnish: Let it sit 5 minutes so it sets up. Sprinkle with chopped parsley or chives, and serve warm.
What Makes This Special
This casserole balances rich flavor with smart, low-carb ingredients. Instead of using pasta or rice, it leans on broccoli and a creamy sauce to keep things satisfying.
The seasoning is straightforward, so the chicken and cheese really shine. It also uses pantry staples you likely have on hand. Best of all, it’s flexible: you can use rotisserie chicken, change the cheese, or add extra veggies without messing it up.
Shopping List
- Cooked chicken (about 4 cups, shredded or cubed; rotisserie works great)
- Broccoli florets (5–6 cups, fresh or frozen)
- Cream cheese (8 oz, softened)
- Heavy cream (3/4 cup)
- Chicken broth (1/2 cup, low-sodium)
- Shredded cheddar cheese (2 cups), plus extra 1/2 cup for topping
- Parmesan cheese (1/2 cup, grated)
- Butter (2 tablespoons)
- Garlic (3 cloves, minced) or 1 teaspoon garlic powder
- Onion powder (1 teaspoon)
- Smoked paprika (1/2 teaspoon)
- Dijon mustard (1 teaspoon)
- Salt and black pepper
- Crushed red pepper flakes (optional, a pinch)
- Fresh parsley or chives for garnish (optional)
Instructions
- Prep the oven and pan: Heat the oven to 375°F (190°C).
Grease a 9×13-inch baking dish with butter or oil.
- Par-cook the broccoli: Steam or microwave the broccoli just until crisp-tender, about 3–4 minutes. If using frozen, thaw and pat dry. Excess water will thin your sauce, so drain well.
- Make the creamy base: In a large skillet over medium heat, melt the butter. Add garlic and cook 30 seconds.
Stir in cream cheese, heavy cream, and chicken broth. Whisk until smooth and gently bubbling.
- Season the sauce: Add Dijon, onion powder, smoked paprika, 1 teaspoon salt, and 1/2 teaspoon pepper. Simmer 2–3 minutes to thicken slightly.
- Stir in cheeses: Remove from heat.
Fold in the cheddar and Parmesan until melted and velvety. Taste and adjust seasoning. A pinch of red pepper flakes adds a nice kick.
- Combine the filling: In a large bowl, mix the cooked chicken and broccoli.
Pour the cheese sauce over and toss until everything is evenly coated.
- Assemble and top: Transfer the mixture to the baking dish. Sprinkle the remaining 1/2 cup cheddar over the top for that golden, bubbly finish.
- Bake: Bake 18–22 minutes, until the edges are bubbling and the top is lightly browned. If you want deeper color, broil 1–2 minutes at the end, watching closely.
- Rest and garnish: Let it sit 5 minutes so it sets up.
Sprinkle with chopped parsley or chives, and serve warm.
Keeping It Fresh
Let leftovers cool, then store in an airtight container. It will keep in the fridge for up to 4 days. Reheat gently in the oven at 325°F until warmed through, or in the microwave in short bursts.
If the sauce thickens too much when reheating, add a splash of cream or broth to bring back the silky texture. For longer storage, portion and freeze for up to 2 months, then thaw overnight in the fridge before reheating.
Why This is Good for You
This casserole fits a keto lifestyle by keeping carbs low and fat moderate to high. Broccoli brings fiber, vitamin C, and vitamin K, which support immune health and bone health. The chicken delivers lean protein that keeps you full and supports muscle repair.
Cheese and cream provide calcium and help with satiety. Together, you get a balanced, filling meal without relying on starchy sides.
What Not to Do
- Don’t skip draining the broccoli. Extra water will dilute the sauce and make the casserole watery.
- Don’t overbake. Too much time in the oven will dry out the chicken and break the sauce.
- Don’t use pre-shredded cheese if you can help it. It’s coated with starches that can affect melting and add sneaky carbs. Freshly shredded melts creamier.
- Don’t forget to taste the sauce. Seasoning the sauce well is the difference between good and great.
- Don’t crowd the pan. If you’re doubling the recipe, use two dishes so it heats evenly.
Variations You Can Try
- Bacon and Ranch: Add 4 slices cooked, crumbled bacon and 1–2 teaspoons ranch seasoning to the sauce.
- Buffalo-Style: Stir 2–3 tablespoons buffalo sauce into the cream sauce and top with blue cheese crumbles.
- Green Goddess: Mix in chopped spinach or kale (well-squeezed dry) and fresh herbs like parsley, chives, and dill.
- Mushroom Swiss: Sauté sliced mushrooms in butter until browned and add with shredded Swiss instead of cheddar.
- Pesto Parmesan: Fold 2 tablespoons basil pesto into the sauce and use extra Parmesan on top.
- Creamy Jalapeño: Add diced pickled jalapeños and a squeeze of lime for a bright, spicy twist.
- Dairy-Lighter: Swap half the heavy cream for unsweetened almond milk and add a teaspoon of xanthan gum to thicken, if needed.
FAQ
Can I use raw chicken instead of cooked?
You can, but it changes the process.
Sauté bite-size pieces in a skillet with salt and pepper until just cooked through, then proceed with the recipe. Starting with cooked chicken is faster and ensures the casserole doesn’t get watery.
Is frozen broccoli okay?
Yes. Thaw it first, then pat very dry.
If it’s wet, the sauce won’t cling as well and the casserole can get soupy.
What cheese works best?
Cheddar is classic, but Gruyère, Monterey Jack, or a sharp white cheddar melt beautifully. Mix and match for flavor depth. Freshly shredding is the key to a smooth sauce.
How can I make it spicier?
Add extra red pepper flakes, a dash of cayenne, or stir in a spoonful of hot sauce to the cream sauce.
You can also use pepper jack cheese.
How many carbs are in a serving?
It depends on your exact ingredients, but a typical serving lands around 5–7 net carbs. Check labels and measure your portions to stay on track.
Can I make it ahead?
Yes. Assemble the casserole up to the point of baking, cover, and refrigerate for up to 24 hours.
When ready to bake, add 5–10 extra minutes since it’s starting cold.
What can I serve with it?
Keep it simple: a crisp green salad with olive oil and lemon, roasted asparagus, or sautéed zucchini. If others at the table aren’t low-carb, buttered rice or garlic bread works for them.
How do I prevent a grainy sauce?
Keep the heat moderate and melt the cheeses off the heat. Overheating can cause separation.
Whisk until smooth and silky before combining with the chicken and broccoli.
Can I make it dairy-free?
It’s tricky but possible. Use a dairy-free cream cheese, unsweetened coconut cream or almond milk for the liquid, and a melty dairy-free cheese you like. You may need a small pinch of xanthan gum to thicken.
Is this freezer-friendly?
Yes, though cream sauces can slightly change texture after freezing.
Freeze in portions, thaw in the fridge, then reheat gently and whisk in a splash of cream if it looks separated.
In Conclusion
Keto Chicken Broccoli Casserole is comfort without the compromise. It’s creamy, cheesy, and built on simple ingredients that work hard for flavor. Keep the broccoli dry, season the sauce well, and don’t overbake—that’s the whole secret.
Make it once, and it will slide into your steady rotation for busy weeknights, meal prep, or any time you want something warm and satisfying.
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