Keto Chicken Broccoli Casserole

This Keto Chicken Broccoli Casserole is a creamy, cheesy comfort-food classic made fully low carb by skipping pasta, rice, and flour-based sauces. Tender pieces of chicken breast are tossed with crisp-tender broccoli florets and baked in a rich, velvety sauce made from heavy cream, cream cheese, and sharp cheddar. The top bakes to a bubbly, golden crust while the inside stays luscious and satisfying, delivering the cozy appeal of a traditional casserole without the carbs. Each serving is packed with protein, fiber, and keto-friendly fats to keep you full and energized, making it ideal for weeknight dinners, meal prep, or feeding guests who will never miss the starch.

Course Casserole, Dinner, Main Course

Cuisine American

Keyword Broccoli, chicken casserole, gluten free, keto, low-carb, meal prep

Prep Time 20

Cook Time 30

Total Time 50

Servings servings

Calories 520kcal

Equipment

9x13-inch Baking Dish
large skillet
Large Pot
Mixing bowl
Whisk

Ingredients

For the chicken and broccoli

2 pounds boneless skinless chicken breast, cooked and shredded or cubed
4 cups broccoli florets, fresh cut into bite-size pieces

For the creamy cheese sauce

4 tablespoons butter
4 ounces cream cheese softened and cut into cubes
1 1/2 cups heavy cream
1/2 cup chicken broth preferably low sodium
2 cups shredded sharp cheddar cheese
1/4 cup grated Parmesan cheese
1 teaspoon garlic powder
1/2 teaspoon onion powder
1 teaspoon sea salt or to taste
1/2 teaspoon black pepper or to taste

For topping and garnish

1 cup shredded sharp cheddar cheese for topping
2 tablespoons fresh parsley, chopped optional, for garnish

Instructions

Preheat the oven to 375°F and lightly grease a 9x13 inch baking dish with butter or oil.
Bring a large pot of salted water to a boil, add the broccoli florets, blanch for about 2 minutes until bright green and crisp tender, then drain well and set aside.
Place the cooked shredded or cubed chicken into a large mixing bowl and add the drained broccoli, then gently toss to combine and transfer the mixture to the prepared baking dish.
Heat a large skillet over medium heat and melt the butter, then add the cream cheese cubes and whisk gently as they soften into the butter.
Pour in the heavy cream and chicken broth while whisking, cooking over medium heat until the mixture is smooth and just starting to simmer.
Whisk in the shredded cheddar, grated Parmesan, garlic powder, onion powder, salt, and black pepper, stirring until the cheese is fully melted and the sauce is thick and velvety.
Taste the sauce and adjust seasoning with additional salt, pepper, or garlic powder if desired to ensure it is well seasoned before baking.
Pour the hot cheese sauce evenly over the chicken and broccoli in the baking dish, using a spatula to spread it so everything is well coated.
Sprinkle the remaining shredded cheddar cheese evenly over the top to create a cheesy crust as the casserole bakes.
Bake the casserole for 20 to 25 minutes until the edges are bubbling and the top is melted and lightly browned.
If you prefer a deeper golden top, place the casserole under the broiler for 2 to 3 minutes, watching closely to prevent burning.
Remove the casserole from the oven and let it rest for about 5 minutes to set slightly before serving.
Garnish with chopped fresh parsley if using and serve warm, optionally pairing with a simple keto-friendly side salad.

Notes

This casserole can be assembled up to 24 hours in advance and stored covered in the refrigerator, then baked when ready to serve, adding a few extra minutes to the baking time if going into the oven cold. Leftovers keep well in an airtight container in the fridge for up to 4 days and reheat best in a 350°F oven until warmed through, or in the microwave using short intervals to avoid separating the sauce. For even fewer carbs, reduce the amount of onion powder or omit the Parmesan, and for extra richness, stir in an additional few tablespoons of cream cheese. Use leftover rotisserie chicken for a faster prep and feel free to add other low carb vegetables like cauliflower or spinach while keeping total net carbs in check.

Nutrition