Creamy Low Carb Chicken Casserole

My sister-in-law first made this for us during a weeknight staycation and I honestly could not stop eating it. The way that rich sauce clings to every piece of chicken and broccoli makes it feel like comfort food without the heavy carb coma afterward. Now it is my go-to when friends are doing keto but still want something that feels indulgent and satisfying on a rainy Tuesday.

Last winter my neighbor was recovering from surgery and needed meals she could freeze. I tripled this recipe and dropped off portions every few days. She texted me later saying it was the first thing that actually made her feel taken care of during weeks of recovery and her teenage son kept asking when I would bring more.

Ingredients

• Boneless skinless chicken breasts: Cutting into bite sized pieces helps everything cook evenly and ensures each forkful gets tender chicken plus sauce
• Broccoli florets: Fresh broccoli holds up better during baking than frozen and adds perfect texture contrast
• Sliced mushrooms: They release moisture as they cook intensifying the savory depth of the cream sauce
• Diced onion and minced garlic: This aromatic foundation builds layers of flavor that develop even more in the oven
• Heavy cream: Creates that luxurious restaurant style texture without needing flour or thickeners
• Shredded mozzarella and grated parmesan: The combination gives you both melt factor and that salty umami punch
• Cream cheese: My secret for making the sauce feel velvety and cling to every piece of chicken
• Chicken broth: Balances the richness of the cream and cheese so nothing feels too heavy
• Dried thyme: Earthy and subtle it complements without overpowering the other flavors
• Salt and black pepper: Essential for bringing all the components together
• Olive oil: For sautéing the aromatics and getting a nice sear on the chicken
• Optional extra mozzarella: That golden bubbly top makes the whole kitchen smell incredible
• Fresh parsley: A bright finish that cuts through all the creaminess beautifully

Instructions

Get your oven ready:

Preheat to 200°C 400°F and grab your favorite casserole dish

Sauté the aromatics:

Heat olive oil in a large skillet over medium heat and cook onions and garlic for 2 to 3 minutes until the kitchen starts to smell amazing

Brown the chicken:

Add chicken pieces and cook 5 to 6 minutes until golden on the outside but still slightly pink inside

Add vegetables:

Toss in mushrooms and broccoli and sauté 3 to 4 minutes until broccoli turns bright green

Remove from heat:

Set the skillet aside while you make the sauce

Make the creamy sauce:

In a saucepan combine heavy cream chicken broth cream cheese dried thyme salt and pepper over gentle heat

Melt in the cheeses:

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

Combine everything:

Mix the chicken vegetable mixture with the sauce in a large bowl until every piece is coated

Assemble the casserole:

Transfer to your greased baking dish and top with extra mozzarella if using

Bake until golden:

Bake 20 to 25 minutes until bubbly and the cheese on top is starting to turn golden

Finish and serve:

Sprinkle with fresh parsley and let it sit 5 minutes before serving

Bookmark

This has become my thing to bring to new parents because it reheats so well and freezes beautifully. My best friend had her second baby last spring and I dropped off a frozen batch. She told me later that during those exhausting newborn nights having something homemade to just pop in the oven made her feel like she could still put a real dinner on the table even while surviving on three hours of sleep.

Making It Ahead

I often assemble everything the night before then bake it right before dinner. The flavors meld together even more in the fridge overnight making it taste like it simmered all day. Just add 5 to 10 minutes to the baking time if baking cold from the refrigerator.

Customizing Your Vegetables

Cauliflower works perfectly instead of broccoli if that is what you have in the crisper drawer. Fresh spinach is another great option but add it during the last minute of sautéing so it just wilts without getting mushy. I have used bell peppers for color and zucchini in summer when the garden is overflowing.

Serving Suggestions

A crisp green salad with acidic dressing cuts through the richness beautifully. Sometimes I serve it over steamed cauliflower rice for my husband who still wants something scooped under the sauce. A chilled dry white wine like sauvignon blanc balances the creaminess perfectly.

• Let the casserole sit 5 minutes before scooping
• Sprinkle extra fresh herbs right before serving for color pop
• The sauce continues thickening as it stands

Bookmark

There is something about pulling this bubbling golden dish out of the oven that makes even a Tuesday night feel special. Hope it becomes a comfort staple in your kitchen too.

Recipe FAQs

→ Can I make this ahead of time?

Absolutely. Assemble everything up to 24 hours in advance, cover tightly, and refrigerate. Add 5-10 minutes to the baking time if cooking from cold.

→ What vegetables work best?

Broccoli holds up beautifully, but cauliflower, spinach, or green beans make excellent substitutes. Feel free to mix and match based on what you have available.

→ Can I freeze leftovers?

Yes, portion into airtight containers and freeze for up to 3 months. Thaw overnight in the refrigerator before reheating at 180°C until hot throughout.

→ How do I make the sauce thicker?

Simmer the sauce a few minutes longer to reduce, or add another tablespoon of cream cheese. The sauce also thickens naturally as it bakes.

→ Is this suitable for meal prep?

Perfect for meal prep. Divide into individual containers after cooling. It reheats beautifully in the microwave or oven for quick lunches throughout the week.