Creamy Low Carb Chicken Casserole

The first time I made this casserole, my apartment smelled so incredible that my neighbor actually knocked on my door to ask what was cooking. That rich, creamy sauce bubbling away in the oven creates an aroma that somehow makes everything feel cozy and right with the world. Now it is my go-to when I want something deeply satisfying without the heavy carb coma that usually follows comfort food.

I brought this to a potluck last winter and watched three different people ask for the recipe before they even finished their first serving. There is something about tender chicken in that velvety sauce that just makes people feel taken care of. My friend who claims to hate casseroles went back for seconds, which I consider a personal victory.

Ingredients

• 600 g boneless skinless chicken breasts: Cutting into bite-sized pieces helps everything cook evenly and ensures each forkful has the perfect chicken-to-sauce ratio
• 200 g broccoli florets: Fresh broccoli holds up better during baking than frozen and adds lovely texture contrast
• 100 g sliced mushrooms: These release moisture as they cook, blending naturally into the creamy sauce
• 80 g diced onion: Foundation of flavor that sweetens beautifully as it sautés
• 2 cloves garlic: Minced fresh adds that aromatic backbone that makes the whole dish feel homemade
• 240 ml heavy cream: The real star that creates that luxurious, restaurant-quality sauce thickness
• 120 g shredded mozzarella cheese: Melts into gorgeous stretches and browns beautifully on top
• 60 g grated parmesan cheese: Adds that salty, umami depth that keeps the sauce from being too one-note
• 120 ml chicken broth: Thins the cream just enough while reinforcing the chicken flavor
• 2 tbsp cream cheese: Secret ingredient for stability and a slight tang that balances the richness
• 1 tbsp olive oil: For sautéing the aromatics and getting a nice sear on the chicken
• 1 tsp dried thyme: Earthy herb that pairs perfectly with both chicken and cream sauces
• ½ tsp ground black pepper: Freshly cracked adds a gentle warmth that cuts through the cream
• ½ tsp salt: Enhances all the other flavors without overpowering the cheese
• 30 g shredded mozzarella: That final topping creates the irresistible golden crust everyone fights over
• 1 tbsp fresh parsley: Bright garnish that adds color and a fresh finish to each rich bite

Instructions

Get your oven ready:

Preheat to 200°C (400°F) so you are not waiting later when everything is ready to go in

Build the flavor base:

Heat olive oil in a large skillet over medium heat and sauté onions and garlic for 2 to 3 minutes until fragrant and translucent

Sear the chicken:

Add chicken pieces and cook for 5 to 6 minutes until browned on the outside but not fully cooked through

Add the vegetables:

Throw in mushrooms and broccoli, sautéing another 3 to 4 minutes until broccoli brightens in color, then remove from heat

Make the creamy sauce:

In a saucepan, combine heavy cream, chicken broth, cream cheese, dried thyme, salt, and pepper, heating gently while stirring until smooth

Melt in the cheese:

Stir in mozzarella and parmesan cheese until melted and sauce thickens nicely, about 2 to 3 minutes

Bring it all together:

Combine your chicken-vegetable mix with the creamy sauce in a large mixing bowl, folding until everything is coated

Assemble for baking:

Transfer the mixture to a greased casserole dish and top with the optional shredded mozzarella

Bake to perfection:

Bake for 20 to 25 minutes until you see bubbling around the edges and golden spots on top

Finish with flair:

Sprinkle fresh parsley over the casserole right before serving for that pop of color

Save

This recipe became a regular in our rotation during a particularly busy season when we needed real food that did not require constant attention. Something about sliding a bubbling dish onto the table makes even a Tuesday night feel like a proper family dinner.

Making It Your Own

Cauliflower works beautifully instead of broccoli if that is what you have on hand, and I have used spinach in a pinch when I needed to use up a bag from the fridge. The vegetable ratio is pretty forgiving as long as you keep the total amount roughly the same.

Time-Saving Shortcuts

Rotisserie chicken shaves off about 15 minutes of prep time, though you will want to skip the initial searing step and just toss the shredded chicken in with the vegetables. I have also used frozen broccoli florets in a rush—just thaw and pat them dry first so they do not water down the sauce.

Serving Suggestions

A crisp green salad with an acidic vinaigrette cuts through the richness perfectly. A dry white wine like sauvignon blanc complements the creamy sauce without competing with it.

• Cauliflower rice makes a great low-carb base if you want to stretch the servings
• Roasted asparagus on the side adds another vegetable without extra work
• Crushed pork rinds or almond flour can replace extra cheese for the topping if you are watching dairy

Save

There is nothing quite like pulling this bubbling, golden casserole out of the oven and watching everyone lean in a little closer. Hope it brings as much comfort to your table as it has to mine.

Recipe FAQs

→ Can I make this ahead of time?

Yes, assemble everything up to 24 hours before baking and store covered in the refrigerator. You may need to add 5-10 minutes to the baking time if baking cold.

→ What vegetables work best as substitutions?

Cauliflower florets, spinach, or bell peppers make excellent alternatives to broccoli. Just keep the total vegetable quantity similar for best results.

→ Can I freeze this casserole?

Absolutely. Assemble in a freezer-safe dish, wrap tightly, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking.

→ How do I make the sauce thicker?

Simmer the sauce longer until it reduces by about one-third, or add a tablespoon of grated parmesan to help thicken naturally.

→ Is this suitable for keto diets?

Yes, with only 7g of carbohydrates per serving and high fat content from heavy cream and cheese, this works perfectly for ketogenic eating plans.

→ Can I use cooked chicken?

Skip browning the chicken and add pre-cooked meat with the vegetables. Reduce the initial sauté time to about 3-4 minutes just to soften the vegetables.