Chicken Spinach and Mushroom Low-Carb Casserole Recipe

If you’re craving a comforting dish that feels like a warm hug but keeps things light and healthy, then this Chicken Spinach and Mushroom Low-Carb Casserole is about to become your new best friend in the kitchen. Combining tender chicken breasts with creamy green onion-infused sauce, earthy mushrooms, and vibrant spinach, this casserole is packed with flavors and textures that make every bite a delight. What’s more, it’s wonderfully low in carbs, making it perfect for anyone wanting to enjoy a hearty meal without the heaviness. Let me walk you through how simple it is to bring this delicious dish to your table!

Ingredients You’ll Need

The beauty of this Chicken Spinach and Mushroom Low-Carb Casserole lies in its simplicity—you only need a handful of ingredients, each fulfilling a crucial role in building flavor, creaminess, and that irresistible cozy texture. Every item is easy to find, yet when combined, they create something truly special.

• Chicken breasts: Thin-sliced for quick, even cooking and a tender bite throughout the casserole.
• Green onion cream cheese: Provides a rich, tangy creaminess with a subtle onion punch that makes the sauce sing.
• Olive oil: Adds healthy fats and helps sauté the mushrooms to golden perfection.
• Chicken broth: Infuses the dish with savory depth while keeping the sauce light and flavorful.
• Sliced mushrooms: Earthy and juicy, they add a satisfying umami boost and texture contrast.
• Fresh baby spinach: Offers a vibrant color and fresh, slightly sweet flavor that balances the richness.
• Weber Herb and Garlic Seasoning: A perfect blend that enhances the chicken with herbal notes and a touch of garlic.
• Shredded mozzarella cheese: Melts beautifully on top to create a golden, bubbly finish.
• Salt and pepper: Essential seasoning to elevate all the other ingredients without overpowering them.

How to Make Chicken Spinach and Mushroom Low-Carb Casserole

Step 1: Prep and Season Your Chicken

Start by heating your oven to 375°F (190°C). Lightly grease a 13×9-inch baking dish so nothing sticks and cleanup stays easy. Arrange the thin-sliced chicken breasts in a single layer in the dish, then generously sprinkle with salt, pepper, and the Weber Herb and Garlic Seasoning. This seasoning mix is a game-changer—don’t shy away from it because it brings out layers of flavor in the chicken that will shine through the whole dish.

Step 2: Sauté the Mushrooms

While your chicken sits ready to bake, heat olive oil in a skillet over medium heat. Toss in the sliced mushrooms and sauté them until they’re softened and just starting to turn golden. This step concentrates their flavor and releases their rich, earthy juices, which will blend beautifully with the other ingredients in the casserole.

Step 3: Layer the Green Goodness

After your mushrooms are perfectly sautéed, spread them evenly over the seasoned chicken in the baking dish. On top of that, add a generous handful of fresh baby spinach. The spinach will wilt down in the oven, adding a lovely texture and fresh note that balances out the creamy and savory elements perfectly.

Step 4: Make the Creamy Sauce

In a separate bowl, combine the green onion cream cheese, chicken broth, and another touch of olive oil. Stir until smooth and slightly emulsified. This sauce is the heart of the Chicken Spinach and Mushroom Low-Carb Casserole—it melds all the ingredients together with that luscious creaminess without weighing it down. Pour the sauce evenly over the chicken, mushrooms, and spinach layers.

Step 5: Bake with Love

Cover the baking dish loosely with foil—just enough to keep moisture in without sealing it completely—and pop it in the oven for 20 minutes. After that, remove the foil and bake for another 20 minutes to let everything meld and the top begin to brown. Finally, sprinkle the shredded mozzarella cheese evenly on top and bake for an additional 5 to 10 minutes until the cheese is melted, bubbly, and golden. This last touch seals in all the flavors and adds an irresistible cheesy crust.

How to Serve Chicken Spinach and Mushroom Low-Carb Casserole

Garnishes

To really elevate your Chicken Spinach and Mushroom Low-Carb Casserole, consider garnishing with a sprinkle of freshly chopped parsley or chives. These herbs add a burst of color and a fresh brightness that complements the creamy richness. For a little extra flair, a light drizzle of a high-quality olive oil or a few flakes of crushed red pepper can surprise your palate with subtle heat and depth.

Side Dishes

This casserole is a star on its own, but pairing it with simple low-carb sides can round out the meal beautifully. Think roasted cauliflower florets, garlic sautéed green beans, or even a crisp mixed greens salad tossed with a light vinaigrette. These options keep the meal well-rounded and colorful without competing with the casserole’s rich flavors.

Creative Ways to Present

For something special, serve this casserole in individual ramekins or small casserole dishes to make each portion feel unique and inviting. Alternatively, adding a sprinkle of toasted pine nuts or slivered almonds on top before serving adds a subtle crunch and nutty dimension that takes your Chicken Spinach and Mushroom Low-Carb Casserole to the next level in both texture and presentation.

Make Ahead and Storage

Storing Leftovers

If you happen to have leftovers (and trust me, it’s hard not to), store them in an airtight container in the refrigerator. This casserole keeps beautifully for up to 3 days and the flavors often deepen as it rests, making it even more delicious the next day.

Freezing

You can definitely freeze the Chicken Spinach and Mushroom Low-Carb Casserole for future meals. Just make sure it is fully cooled, then cover it well with plastic wrap and aluminum foil or place it in a freezer-safe container. It will keep well for up to 2 months. When you’re ready to enjoy, thaw it overnight in the fridge before reheating.

Reheating

To reheat, cover the casserole with foil and warm it in a 350°F (175°C) oven until heated through—this usually takes about 20 minutes. For that extra melty finish, remove the foil in the last 5 minutes to allow the cheese to rejuvenate its golden bubbly texture. Microwave reheating is possible, but the oven definitely gives you the best texture and flavor revival.

FAQs

Can I use frozen spinach instead of fresh?

Frozen spinach works in a pinch but make sure to drain it thoroughly to avoid extra moisture in your casserole. Fresh baby spinach gives the best texture and a fresher flavor contrast with the creamy sauce.

Is this casserole suitable for meal prep?

Absolutely! It’s perfect for meal prep since it stores and reheats well. Make a big batch on the weekend, portion it out, and enjoy hassle-free dinners throughout the week.

Can I substitute the mozzarella cheese?

You can swap in other melty cheeses like Monterey Jack or cheddar if you prefer a different flavor profile. Just keep in mind that mozzarella’s mildness balances the other ingredients without overpowering them.

How do I make this dish dairy-free?

For a dairy-free version, try using a dairy-free cream cheese alternative and a plant-based shredded cheese substitute. Be mindful of checking labels to ensure the ingredients fit your dietary needs.

Is this recipe gluten-free?

Yes! The Chicken Spinach and Mushroom Low-Carb Casserole is naturally gluten-free, making it a great option for those avoiding gluten without sacrificing flavor or comfort.

Final Thoughts

I hope you’re feeling inspired to bring this Chicken Spinach and Mushroom Low-Carb Casserole to your dinner table soon. It’s one of those dishes that feels indulgent yet wholesome, simple yet special. Once you taste how the creamy sauce, tender chicken, earthy mushrooms, and fresh spinach all come together, you’ll understand why it’s such a favorite. Happy cooking and enjoy every single comforting bite!

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