When it comes to quick weeknight dinners, I’m always searching for meals that check every box — comforting, easy to prepare, and family-approved. This Keto Chicken Broccoli Casserole does exactly that. Tender chicken, crisp broccoli, and a creamy, garlicky Alfredo-style sauce come together in a cheesy bake that’s impossible to resist. Every bite is rich, savory, and perfectly satisfying — all while staying low in carbs and high in protein.
The best part? This hearty one-pan meal comes together in under 25 minutes! It’s a staple at my house right next to other favorites like Keto Taco Pie and Low Carb Cauliflower Bake.
A warm, bubbling skillet of cheesy chicken and broccoli casserole fresh out of the oven truly feels like comfort food done right.
Why You’ll Love This Keto Chicken Broccoli Casserole
- Quick & Easy: With pre-cooked chicken on hand, dinner is ready in less than 25 minutes.
- Creamy Alfredo Flavor: The sauce is thick, garlicky, and coats every bite perfectly.
- One-Pan Dinner: Everything cooks in a single skillet for easy cleanup.
- High in Protein: Packed with lean chicken and cheese — perfect for keto and low-carb diets.
- Family Favorite: Even picky eaters will love this creamy casserole.
- Meal-Prep Friendly: Store it for up to 5 days and reheat when you need a quick meal.
- Low Carb: Only 6–7 grams of net carbs per serving — perfect for staying in ketosis.
Ingredient Notes
To make this Keto Chicken Broccoli Casserole, you only need a handful of simple ingredients:
- Cooked Chicken: Use any cooked boneless chicken — shredded, cubed, or even rotisserie-style for convenience.
- Broccoli Florets: Fresh broccoli gives the best texture and color, but frozen works too (see tips below).
- Heavy Cream: This replaces traditional thickeners like flour, creating a rich and creamy sauce.
- Mozzarella Cheese: Melts beautifully and gives the dish that gooey, stretchy top layer.
- Parmesan Cheese: Adds sharpness and depth to the Alfredo sauce.
- Butter & Garlic: Classic combo that builds the base flavor for the sauce.
- Salt & Pepper: Simple seasoning that ties it all together.
Optional add-ins include a sprinkle of crushed red pepper for a little heat, or cooked bacon bits for an extra smoky flavor boost.
How to Make Keto Chicken Broccoli Casserole
Step 1: Sauté the Broccoli
In a large oven-safe skillet, melt part of the butter and sauté the broccoli over medium heat until it turns bright green and just tender. Transfer to a bowl and set aside.
Step 2: Prepare the Sauce
In the same skillet, melt the remaining butter and add the minced garlic. Cook for 30 seconds until fragrant, then pour in the heavy cream. Let it simmer gently until reduced and thickened — this should take about 3 to 4 minutes.
Step 3: Add the Cheese
Stir in the Parmesan and half of the mozzarella. Continue stirring until the sauce becomes creamy and smooth. Season with salt and pepper to taste.
Step 4: Combine Everything
Add the cooked broccoli and chicken to the sauce. Stir until everything is coated evenly. Sprinkle the remaining mozzarella cheese over the top.
Step 5: Broil to Perfection
Place the skillet under the broiler for 2–3 minutes until the top turns bubbly and golden brown. Serve hot and enjoy!
Tips for Success
- Use an Ovenproof Skillet: This dish goes straight from stovetop to oven. A cast-iron or stainless steel skillet works best.
- Don’t Skimp on Broccoli: Using at least 3 cups of broccoli keeps the dish hearty and nutrient-rich.
- Using Frozen Broccoli: Thaw completely and skip the sautéing step. Add it directly to the sauce instead.
- Make Ahead: Assemble the casserole, cover tightly, and refrigerate for up to 2 days before baking.
- For Extra Creaminess: Add 2 ounces of softened cream cheese when making the sauce.
Frequently Asked Questions
What kind of chicken should I use?
Boneless, skinless chicken breasts or thighs work perfectly. I personally prefer thighs because they stay juicier and have more flavor. Rotisserie chicken is also a time-saving option — just remove the skin and bones.
Can I store leftovers?
Absolutely! Keep leftovers in an airtight container in the refrigerator for up to 5 days. Reheat in the microwave or oven until warm and bubbly.
How many carbs are in this Keto Chicken Broccoli Casserole?
Each serving contains about 6.8g total carbs, 2.3g fiber, and 4.5g net carbs — making it perfect for keto or low-carb meal plans.
Keto Chicken Broccoli Casserole
- Total Time: 25 min
Description
This Keto Chicken Broccoli Casserole is a rich, creamy, and comforting low-carb dinner that comes together in just 25 minutes. Loaded with tender chicken, vibrant broccoli, and a cheesy Alfredo sauce, it’s the perfect high-protein one-pan meal for busy weeknights.
Ingredients
2 cups cooked chicken, shredded or cubed
16 oz broccoli florets (about 3 cups)
1 cup heavy whipping cream
1 ½ cups mozzarella cheese, divided
½ cup freshly grated Parmesan cheese
3 tablespoons butter
2 cloves garlic, minced
½ teaspoon salt, or to taste
¼ teaspoon black pepper
Optional: pinch of red pepper flakes or cooked bacon bits for extra flavor
Instructions
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Sauté the Broccoli
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Melt 1 tablespoon of butter in a large oven-safe skillet over medium heat.
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Add broccoli florets and cook for 3–4 minutes until bright green and just tender.
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Remove from the pan and set aside.
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Make the Alfredo Sauce
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Add the remaining 2 tablespoons butter to the same skillet.
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Stir in minced garlic and cook for 30 seconds until fragrant.
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Pour in heavy cream and let it simmer 3–4 minutes, stirring occasionally, until slightly reduced.
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Add the Cheese
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Lower the heat and add Parmesan and 1 cup of mozzarella.
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Stir until melted and smooth. Season with salt and pepper.
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Combine Chicken and Broccoli
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Return broccoli to the skillet and add cooked chicken.
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Mix until everything is evenly coated with sauce.
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Top and Broil
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Sprinkle the remaining ½ cup mozzarella on top.
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Broil 2–3 minutes or bake at 400°F (200°C) until the cheese is golden and bubbly.
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Serve & Enjoy
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Let cool slightly before serving. This dish pairs perfectly with a simple green salad or cauliflower rice.
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Notes
- Make-Ahead Option: Assemble the casserole up to 2 days in advance. Cover and refrigerate until ready to bake.
- Frozen Broccoli Tip: If using frozen broccoli, thaw completely and skip the sauté step — add it straight to the sauce.
- Extra Creaminess: Add 2 oz cream cheese to the sauce if you prefer a thicker texture.
- Storage: Store leftovers in an airtight container for up to 5 days. Reheat in the oven or microwave until hot.
- Freezer Friendly: Freeze portions for up to 2 months. Thaw overnight in the fridge before reheating.
- Prep Time: 10 min
- Cook Time: 15 min
- Method: Baking
- Cuisine: American
