Creamy Low Carb Chicken Casserole

The first time I made this casserole, my kitchen smelled like garlic and thyme for days. My roommate poked her head in, asking what restaurant I had ordered from, and looked genuinely shocked when I pointed to a bubbling dish in the oven.

Last winter, my sister came over after a brutal week at work, and I pulled this casserole out of the oven. She took one bite, closed her eyes, and said this was exactly what she had been craving without knowing it existed.

Ingredients

• Boneless chicken breasts: Cutting these into bite-sized pieces helps them cook evenly and absorb more of that creamy sauce
• Broccoli florets: Fresh broccoli holds up better during baking than frozen, which can release too much water
• Sliced mushrooms: These become tender and savory as they roast, adding earthiness to every bite
• Diced onion: Yellow onions work beautifully here, becoming sweet and mellow as they sauté
• Minced garlic: Fresh garlic cloves give you that aromatic foundation that builds the entire flavor profile
• Heavy cream: This creates the luxurious body of the sauce, so avoid substitutions for the best texture
• Shredded mozzarella: Low-moisture mozzarella melts beautifully without making the sauce grainy
• Grated parmesan: Adds a salty, nutty depth that rounds out the richness of the cream
• Chicken broth: Use a good quality broth to reinforce the savory notes without overpowering the cream
• Cream cheese: Room temperature cream cheese incorporates smoothly and adds tanginess
• Olive oil: A little fat for sautéing the aromatics and getting a nice sear on the chicken
• Dried thyme: Woodsy and fragrant, thyme pairs perfectly with chicken and cream
• Salt and pepper: Essential for seasoning, but taste as you go since the cheeses add saltiness
• Optional topping: That extra layer of mozzarella creates the most irresistible golden crust
• Fresh parsley: Adds a bright, herbal contrast against all the creamy richness

Instructions

Get your oven ready:

Preheat to 200°C (400°F) so it is hot and waiting when your filling is ready

Sauté the aromatics:

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

Brown the chicken:

Add chicken pieces to the skillet and cook for 5 to 6 minutes until golden on the outside but still slightly pink in the center

Add the vegetables:

Toss in mushrooms and broccoli and sauté for another 3 to 4 minutes until broccoli turns bright green, then remove from heat

Make the creamy sauce:

Combine heavy cream, chicken broth, cream cheese, dried thyme, salt, and pepper in a saucepan and heat gently while stirring until smooth

Melt in the cheese:

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

Combine everything:

Pour the chicken and vegetable mixture into a large bowl and add the creamy sauce, tossing gently to coat everything evenly

Assemble the casserole:

Transfer the mixture to a greased casserole dish and sprinkle with extra mozzarella if you want that cheesy golden top

Bake until bubbly:

Bake for 20 to 25 minutes until the sauce is bubbling around the edges and the top is beautifully golden

Finish with freshness:

Sprinkle chopped fresh parsley over the top right before serving to add a pop of color and bright herbal flavor

Save

This recipe became my go-to for new parents and friends recovering from surgery. It freezes well, reheats perfectly, and somehow manages to taste even better the next day.

Make It Your Own

I have swapped broccoli for cauliflower, spinach, or even asparagus depending on what is in my fridge. The creamy base adapts beautifully to whatever vegetables you have on hand.

Save Time on Busy Nights

Using a rotisserie chicken shaves off about 15 minutes of prep time. Just skip the browning step and add the shredded chicken directly with the vegetables.

Perfect Pairings

A crisp green salad with a bright vinaigrette cuts through the richness perfectly. I also love serving this with a glass of dry white wine.

• Cauliflower rice makes a great low carb base if you want to stretch the servings
• Roasted asparagus on the side adds another seasonal vegetable to the plate
• Leftovers reheat beautifully at 175°C (350°F) for about 15 minutes

Save

There is something so comforting about pulling a bubbling casserole out of the oven, especially when you know it is going to make everyone at the table happy.

Recipe Questions

→ Can I make this ahead of time?

Yes, assemble the dish up to 24 hours in advance and refrigerate. Add 5-10 minutes to baking time if cooking cold from the refrigerator.

→ What vegetables work best?

Broccoli and mushrooms complement the creamy sauce beautifully. You can also substitute cauliflower, spinach, or green beans based on preference.

→ How do I store leftovers?

Store in an airtight container in the refrigerator for 3-4 days. Reheat in the microwave or oven at 180°C until warmed through.

→ Can I freeze this dish?

Freeze before baking for best results. Thaw overnight in the refrigerator, then bake as directed. The texture may vary slightly after freezing.

→ Is this suitable for meal prep?

Absolutely. Portion into individual containers after cooling. Reats well and the flavors often improve after a day or two in the refrigerator.