A simple one-dish meal, this keto chicken casserole is easy to assemble and practically bakes itself. It’s the ultimate weeknight dinner!
I love casseroles because they make my life so easy. You throw a few ingredients into the casserole dish, bake, and voila – dinner is ready! Plus they are tasty, and everyone loves them, kids and adults.
This delicious casserole is keto, filling, and so easy to make. If you have precooked chicken (such as this broiled chicken breast), it’s ready in just a few minutes! But even if you need to cook the chicken first, this recipe is still very easy to make.
The ingredients you’ll need
Here’s an overview of the ingredients you’ll need to make this keto chicken casserole. The exact measurements are included in the recipe card below.
Chicken breasts: You can also use rotisserie chicken, but be sure to remove the skin. It will feel rubbery in a casserole.
Kosher salt and black pepper: If using fine salt, you might want to reduce the amount you use.
For the sauce: Mayonnaise (I prefer mayo made with avocado oil), sour cream, Dijon mustard, garlic, spices, and shredded cheddar.
Topping: Scallions and bacon bits. if you’re not a fan of processed meats, you can simply omit the bacon.
How to make keto chicken casserole
This casserole is the ultimate weeknight dinner – easy, quick and filling. It also has the added advantage of turning boring chicken breasts into something a bit more exciting. Scroll down for the detailed directions. Here are the basic steps:
Cook the chicken. You bake the chicken, then cube it. Mix the chicken cubes with a creamy homemade sauce.
Transfer the mixture to a baking dish and top with cheese. Bake until hot and bubbly.
Finish the dish: Sprinkle scallions and bacon bits on top for extra flavor and a gorgeous presentation.
Is it creamy?
This casserole is just creamy enough for my taste, and my family likes it this way too. But if you’d like it to be extra creamy, I suggest you increase the mayonnaise and sour cream to 1/3 cup each.
What to serve with keto chicken casserole?
I usually serve it with a green vegetable, such as steamed broccoli or spicy green beans, to round out the meal.
If you’d like, you can very lightly steam small broccoli florets and mix them into the casserole before the final stage of baking, making it a complete meal. If you do, I suggest you increase the mayonnaise and sour cream to 1/3 cup each.
What to do with the leftovers?
You can keep leftovers of this keto chicken casserole in the fridge, in a sealed container, for about 3 days. Gently reheat them, covered, in the microwave on 50% power, to avoid drying out the chicken.
However, if you’ve used precooked chicken in this recipe that has already spent a couple of days in the fridge, you should take that into account when deciding how long you can keep the leftovers.
More chicken recipes that you might enjoy
There are other ways, of course, to make chicken breast interesting. A few of my favorite ones include:
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Keto Chicken Casserole
INGREDIENTS
Chicken:
- 4 (8 oz) boneless skinless chicken breasts
- Avocado oil spray
- ½ teaspoon Diamond Crystal kosher salt
- ¼ teaspoon black pepper
Sauce:
- ¼ cup avocado oil mayonnaise (1/3 cup for a creamier casserole)
- ¼ cup sour cream (1/3 cup for a creamier casserole)
- 1 tablespoon Dijon mustard
- 1 tablespoon minced fresh garlic
- ½ teaspoon Diamond Crystal kosher salt
- ¼ teaspoon black pepper
- ½ teaspoon dried thyme
- ½ teaspoon paprika
- ¼ teaspoon cayenne pepper
- 1 cup shredded sharp cheddar, divided
Topping:
- ¼ cup sliced scallions (green parts)
- ¼ cup bacon bits, room temperature
INSTRUCTIONS
- Preheat oven to 450 degrees F. Line a baking dish with parchment paper. Arrange the chicken breasts in the prepared pan. Spray with oil and sprinkle with salt and pepper. Bake until cooked through, about 20 minutes.
- Meanwhile, grease a 2-quart casserole dish. In a large bowl, mix together the mayonnaise, sour cream, Dijon mustard, minced garlic, salt, pepper, dried thyme, paprika, cayenne and ½ cup of the shredded cheddar.
- When the chicken is cooked, remove it from the oven but keep the oven on. Allow the chicken to slightly cool, until it’s easier to handle. Cut it into cubes, or shred it. Add the chicken cubes to the bowl with the mayonnaise-sour cream mixture and toss to coat.
- Transfer the mixture to the prepared casserole dish. Sprinkle with the remaining ½ cup of shredded cheddar. Bake until the cheese is melted, 5-10 minutes. If your casserole dish is broiler-safe, you can broil it instead, 6 inches below the broiler element (not directly below), for 30 seconds to 1 minute.
- Sprinkle the casserole with sliced scallions and bacon bits. Serve immediately.
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Vered DeLeeuw, LL.M., CNC, has been following a low-carb real-food diet and blogging about it since 2011. She's a Certified Nutrition Coach (NASM-CNC), has taken courses at the Harvard School of Public Health, and has earned a Nutrition and Healthy Living Certificate from Cornell University. Her work has appeared in several major media outlets, including Healthline, HuffPost, Today, Women's Health, Shape, Reader's Digest, and Better Homes and Gardens.