Keto Cheesy chicken broccoli casserole is an easy keto dinner made with tender broccoli, cooked chicken, garlic, cream, mozzarella, and Parmesan cheese. Everything comes together in one ovenproof skillet, making this a practical meal for busy evenings. With only 6.8 grams of total carbohydrates and 2.3 grams of fiber per serving, it provides 4.5 grams of net carbs.
Why Make This Keto Casserole
This keto chicken broccoli casserole is filling, creamy, and simple to prepare. The cooked chicken adds protein, while broccoli provides vegetables and fiber. Mozzarella and Parmesan melt into the creamy garlic sauce, giving the casserole a rich texture without adding pasta, rice, or another high-carb ingredient.
A Quick Chicken Dinner
The preparation takes only 5 minutes, while the cooking time is 16 minutes. Because the recipe uses cooked, chopped chicken, there is no need to wait for raw chicken to cook through. The broccoli is sautéed first, followed by a quick cream sauce, and everything is finished under the broiler with melted mozzarella.
Ingredients for the Casserole
The recipe uses butter, broccoli, garlic, heavy whipping cream, mozzarella, Parmesan, salt, pepper, and cooked chopped chicken. These ingredients work together without requiring a long list of seasonings. Keeping the ingredient list simple also makes this casserole convenient when you need a quick keto-friendly meal.
Preparing the Broccoli
Begin with 16 ounces of coarsely chopped broccoli. Heat an ovenproof 10-inch skillet over medium heat and add one tablespoon of the butter. Once the butter melts, add the broccoli and sauté it for about four minutes. It should become bright green and just tender without turning overly soft.
Why Cook the Broccoli First
Cooking the broccoli before adding the other ingredients helps control its texture. The short sauté allows the vegetable to soften while retaining some firmness. Removing the broccoli from the skillet after cooking also creates space for the garlic cream sauce, allowing the sauce to develop its flavor before everything is combined.
Making the Garlic Cream Sauce
Add the remaining tablespoon of butter to the same skillet. Once melted, add the minced garlic and cook for about one minute, just until fragrant. Pour in the heavy whipping cream and bring it to a simmer. Allow it to cook for three to five minutes so it reduces and becomes thicker.
Adding Mozzarella and Parmesan
Once the cream sauce has thickened, stir in one-third cup of the shredded mozzarella and all of the grated Parmesan cheese. Keep stirring until the cheese melts into the sauce. Season with salt and pepper according to taste. The result should be a creamy cheese sauce that coats the ingredients easily.
Combining Chicken and Broccoli
Return the sautéed broccoli to the skillet along with the cooked chopped chicken. Stir gently until the chicken and vegetables are covered with the creamy sauce. Using cooked chicken makes this step especially quick. About four cups of chopped chicken are used for the recipe, providing a substantial protein component.
Choosing Cooked Chicken
The recipe calls for 1 1/2 pounds of cooked, chopped chicken. You can prepare the chicken ahead of time and keep it refrigerated until needed. Chopping it into bite-sized pieces makes the casserole easier to serve and helps the chicken mix evenly with the broccoli and sauce.
Adding the Final Cheese Layer
After the chicken and broccoli have been combined with the sauce, spread the mixture evenly in the skillet. Sprinkle the remaining one cup of shredded mozzarella over the top. This final layer melts under the broiler and creates the browned, cheesy surface that makes the casserole especially appealing.
Broiling the Casserole
Preheat the broiler before placing the skillet under the heat. Position the pan about six inches from the broiler and cook until the mozzarella begins to brown. This usually takes two to five minutes, although the exact time depends on the strength of your broiler. Watch closely because the cheese can brown quickly.
Getting the Cheese Golden
The purpose of broiling is to melt the final mozzarella layer and give it a lightly browned surface. You do not need to broil the casserole for a long time. Once the cheese has melted and begins to develop brown spots, remove the skillet from the oven and allow it to rest briefly before serving.
One-Skillet Keto Dinner
Using an ovenproof skillet keeps the cooking process simple because the broccoli, sauce, chicken, and cheese can all be prepared in the same pan. Fewer dishes also make cleanup easier. If your skillet is not ovenproof, transfer the mixture to a suitable baking dish before adding the final cheese layer and broiling.
Creamy Chicken Broccoli Texture
The heavy whipping cream creates the base of the sauce, while mozzarella and Parmesan provide thickness and cheese flavor. Reducing the cream before adding the first portion of cheese is important because it prevents the sauce from being too thin. Once the chicken and broccoli are stirred in, the sauce should cling to the ingredients.
Keeping the Broccoli Tender
The broccoli should be sautéed only until bright green and just tender. Overcooking it at this stage can make it soft once the casserole reaches the broiler. A short four-minute sauté is enough to start the cooking process while leaving the broccoli with some texture in the finished dish.
Garlic for Extra Flavor
Four cloves of minced garlic are used in the cream sauce. Garlic only needs about one minute of cooking before the cream is added. Cooking it briefly brings out its aroma while helping prevent it from becoming bitter. The garlic then blends into the cream and cheese for a savory sauce.
How the Chicken Adds Protein
Chicken makes this casserole more substantial than a vegetable-only cheese bake. The recipe provides 31.9 grams of protein per serving based on the supplied nutritional information. Combined with broccoli and a creamy cheese sauce, the chicken helps turn a simple casserole into a complete meal.
Understanding the Carbohydrates
Each serving contains 6.8 grams of total carbohydrates and 2.3 grams of fiber. That works out to approximately 4.5 grams of net carbohydrates per serving. The relatively low carbohydrate content comes partly from using broccoli instead of pasta, potatoes, or rice as the main vegetable base.
Keto Meal Planning
This cheesy chicken broccoli casserole fits naturally into a keto meal plan because it focuses on chicken, broccoli, cheese, butter, and heavy whipping cream. It does not require a flour-based thickener or a pasta component. For a complete meal, it can be served on its own or with another low-carbohydrate vegetable.
Serving the Casserole
Divide the finished casserole into six servings according to the provided nutrition information. Serve it warm while the mozzarella topping is still soft and stretchy. The creamy sauce pairs with the chicken and broccoli in every portion, while the browned cheese on top adds a slightly firmer texture.
Storing Leftovers
Leftover chicken broccoli casserole can be stored in a covered container in the refrigerator for up to five days. Allow the casserole to cool before refrigerating it. Keeping the leftovers covered helps maintain their texture and prevents the casserole from absorbing odors from other foods in the refrigerator.
Reheating Leftovers
When reheating refrigerated portions, warm them until heated through. Smaller portions can be reheated individually, while several servings can be warmed in an oven-safe dish. The cheese topping may soften after refrigeration, but reheating can restore some of its melted texture.
Choosing Mozzarella
Mozzarella is divided between the sauce and the final topping. One-third cup is melted into the cream sauce along with the Parmesan, while the remaining one cup is placed over the casserole before broiling. This two-stage use gives the dish both a creamy cheese sauce and a melted cheese topping.
Role of Parmesan Cheese
Parmesan adds a stronger savory cheese flavor to the cream sauce. Unlike the mozzarella, it is not used as the final topping. It melts into the cream with the first portion of mozzarella, helping create a richer sauce that coats the chicken and broccoli.
Using Butter
The butter is divided into two portions. The first tablespoon is used to sauté the broccoli, while the remaining tablespoon is melted before the garlic is added. Dividing the butter this way gives both the vegetable base and the cream sauce enough fat for cooking.
Seasoning With Salt and Pepper
The recipe keeps seasoning simple with salt and pepper. Because Parmesan and mozzarella already contain some salt, taste the sauce before adding a large amount. Season gradually until the creamy mixture has enough flavor. Freshly ground pepper can also complement the rich cheese and garlic.
Cooking for a Busy Weeknight
This casserole is especially useful when you need dinner without a long cooking process. The chicken is already cooked, the broccoli takes only a few minutes to sauté, and the cream sauce thickens quickly. After combining the ingredients, the final broiling step takes only a few minutes.
Making the Recipe Ahead
The cooked chicken can be prepared in advance and refrigerated until you are ready to make the casserole. Having chopped chicken available makes the recipe even faster. The broccoli and sauce are best prepared close to serving so the finished dish retains its intended texture.
The Broiler
Broilers vary considerably in intensity, so the stated two-to-five-minute range is only a guide. Keep the skillet around six inches from the heat and watch the mozzarella closely. The goal is melted cheese that is beginning to brown rather than a deeply burned topping.
The Skillet
A 10-inch ovenproof skillet is specified for this recipe. Its size gives the chicken, broccoli, and sauce enough room to combine evenly while keeping the cheese layer at a useful thickness. Make sure the skillet handle and other parts are suitable for broiler use before placing it under the heat.
Thick Sauce
The heavy cream needs to simmer for three to five minutes before the first portion of cheese is added. This reduction helps create a thicker sauce. If the cream has not reduced enough, the finished casserole may be looser than expected. Stir gently and avoid rushing this part of the process.
Notes on the Chicken
The chicken should be cooked before it is added to the skillet. Chop it into manageable pieces so it blends easily with the broccoli. Since the chicken is already cooked, the main purpose of adding it to the sauce is to warm it and coat it with the creamy mixture before the final broiling stage.
Storage
The supplied recipe recommends storing the casserole in a covered container in the refrigerator for up to five days. Divide leftovers into convenient portions if you expect to reheat them individually. Always refrigerate leftovers promptly rather than leaving the finished casserole at room temperature for an extended period.



