Creamy Low Carb Chicken Casserole

I found this recipe during a particularly chaotic Tuesday when the fridge had random bits of everything and zero inspiration. The aroma of thyme and melting parmesan filled my tiny apartment kitchen, making even the piles of mail on the counter feel somehow cozy. Now it is my go to when I want something that feels indulgent but actually keeps my energy steady through long work afternoons.

My sister claimed she hated casseroles until she walked in while this was bubbling away in the oven. She actually stood there hovering, asking every three minutes if it was done yet. That golden cheese crust on top creates the kind of kitchen moment that makes people cancel their dinner plans and stay at your table instead.

Ingredients

• 600 g (1.3 lbs) boneless skinless chicken breasts: Cut into bite sized pieces because nobody wants to wrestle with giant chunks while eating
• 200 g (1 ½ cups) broccoli florets: Fresh adds the perfect little crunch but frozen works in a pinch
• 100 g (¾ cup) sliced mushrooms: They release this incredible umami richness into the sauce as they cook
• 80 g (½ cup) diced onion: The foundation that makes everything else taste better
• 2 cloves garlic: Freshly minced because jarred garlic just hits different
• 240 ml (1 cup) heavy cream: Do not even try substituting, this creates that luxurious restaurant quality texture
• 120 g (1 cup) shredded mozzarella cheese: Low moisture cheese melts better without making things watery
• 60 g (½ cup) grated parmesan cheese: The salty nutty depth that ties the whole sauce together
• 120 ml (½ cup) chicken broth: Use the good stuff, it really does matter
• 2 tbsp cream cheese: My secret weapon for making sauces feel velvety and rich
• 1 tbsp olive oil: Just enough to get those aromatics started right
• 1 tsp dried thyme: Earthy and comforting, like a hug in herb form
• ½ tsp ground black pepper: Freshly cracked makes a noticeable difference
• ½ tsp salt: Adjust this based on how salty your parmesan is
• 30 g (¼ cup) shredded mozzarella cheese optional: For that Instagram worthy golden blanket on top
• 1 tbsp fresh parsley: Brightens up all that rich creamy goodness

Instructions

Get your oven ready:

Preheat to 200°C (400°F) because waiting for an oven when everything else is prepped is pure kitchen torture

Build your flavor base:

Heat olive oil in a large skillet over medium heat, then sauté onions and garlic for 2 to 3 minutes until the smell makes your stomach growl

Sear the chicken:

Add chicken pieces and cook for 5 to 6 minutes until browned but not cooked through, they will finish in the oven

Add the vegetables:

Toss in mushrooms and broccoli, sautéing another 3 to 4 minutes until everything looks vibrant and smells amazing

Make the magic sauce:

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

Melt in the cheese:

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

Bring it all together:

Combine that gorgeous chicken vegetable mixture with the creamy sauce in a large bowl, watching everything get coated in perfection

Ready for the oven:

Transfer the mixture to a greased casserole dish and top with the optional shredded mozzarella because you deserve it

Bake until bubbly:

Slide it into the oven for 20 to 25 minutes until the top is golden and the sauce is bubbling up the edges

Finish with freshness:

Sprinkle fresh parsley over the top right before serving to cut through all that richness

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This casserole has become my comfort food default, the one dish that somehow feels fancy but comes together on busy weeknights without any stress. My partner actually asked if we could have it every Monday, and honestly I was not opposed to the idea at all.

Make It Your Own

Cauliflower or spinach work perfectly if broccoli is not your thing. I have made this with whatever vegetables were hiding in the crisper drawer, and it always turns out comforting and delicious.

Shortcuts That Actually Work

Rotisserie chicken shaves off so much prep time on busy nights. Just skip the searing step and add the shredded chicken when you combine everything with the sauce.

Serving Ideas

A crisp green salad on the side cuts through the richness perfectly. Sometimes I pour a glass of dry white wine while it bakes because the aromas make me feel like I am in a fancy bistro instead of my kitchen.

• Warm crusty bread for dipping if you are not strictly low carb
• Roasted asparagus makes an elegant spring dinner
• Leftovers reheat at 175°C (350°F) for about 15 minutes

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There is something so satisfying about pulling a bubbling golden casserole out of the oven, knowing dinner is handled and it is going to be good.

Recipe FAQs

→ Can I make this casserole ahead of time?

Yes, you can assemble the entire casserole up to 24 hours in advance and refrigerate. When ready to bake, add 5-10 minutes to the cooking time since it will be cold.

→ What vegetables work best in this dish?

Broccoli and mushrooms are classic choices, but you can easily substitute cauliflower, spinach, bell peppers, or zucchini based on what you have available or prefer.

→ Can I use cooked chicken instead of raw?

Absolutely. Using rotisserie chicken or leftover cooked chicken reduces prep time significantly. Simply skip the browning step and combine the cooked chicken with the vegetables and sauce before baking.

→ How should I store leftovers?

Store leftover portions in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave or oven at 350°F until warmed through.

→ Is this casserole freezer-friendly?

Yes, you can freeze the assembled unbaked casserole for up to 3 months. Thaw overnight in the refrigerator before baking, or add about 15 minutes to the baking time if cooking from frozen.

→ What can I serve with this casserole?

A crisp green salad with vinaigrette provides a fresh contrast to the rich, creamy dish. It also pairs beautifully with roasted cauliflower or steamed green beans.