Chicken Spinach and Mushroom Low-Carb Casserole Recipe

If you’re craving a comforting yet healthy dish that perfectly balances flavor and low-carb goodness, let me introduce you to the ultimate Chicken Spinach and Mushroom Low-Carb Casserole. This recipe brings together tender chicken breasts, earthy mushrooms, and vibrant spinach all coated in a creamy, dreamy sauce that’s studded with green onion cream cheese and finished with golden, bubbly mozzarella. It’s a simple, no-fuss casserole that’s bursting with hearty textures and fresh, savory notes—ideal for weeknight dinners or when you want to impress without hours in the kitchen.

Ingredients You’ll Need

Each ingredient in this recipe plays an essential role, from building the base flavors to creating rich textures and eye-catching color. The beauty here is in the simplicity and harmony of components that are both wholesome and flavorful.

• 6 thin-sliced chicken breasts: These cook quickly and stay tender throughout baking, forming the hearty protein foundation.
• 1 container (8 oz) green onion cream cheese: Adds a silky, aromatic creaminess that ties the whole casserole together.
• ¼ cup olive oil: Great for sautéing mushrooms and enriching the sauce with a smooth mouthfeel.
• ½ cup chicken broth: Provides moisture and deep umami, enhancing flavor without adding carbs.
• 1 large package of sliced mushrooms: Brings an earthy savor and meaty texture to complement the chicken.
• 1 small bag of fresh baby spinach: Adds a burst of vibrant green color and a mild, fresh flavor that balances richness.
• 1 dash Weber Herb and Garlic Seasoning: A perfect blend of herbs and garlic, seasoning the chicken beautifully.
• 8 oz shredded mozzarella cheese: Melts into a golden, gooey topping that makes every bite irresistible.
• Salt and pepper to taste: Essential for layering basic seasoning and bringing out the natural flavors of the dish.

How to Make Chicken Spinach and Mushroom Low-Carb Casserole

Step 1: Prepare and Season the Chicken

Start by preheating your oven to 375°F (190°C) and lightly greasing a 13×9-inch baking dish. Lay the thin-sliced chicken breasts in a single layer, then season generously with salt, pepper, and that fragrant Weber Herb and Garlic Seasoning. This step ensures every bite of chicken is packed with flavor right from the start.

Step 2: Sauté Mushrooms for Earthy Goodness

Heat the olive oil in a skillet over medium heat and sauté the sliced mushrooms until they’re soft and golden. This concentrates their earthy flavor and releases their delicious juices that will mingle with the other ingredients in the casserole.

Step 3: Layer in Spinach and Mushrooms

Over the seasoned chicken, layer the sautéed mushrooms first, then crown them with fresh baby spinach. The spinach will wilt and add a fresh, green brightness to the hearty base, creating a perfect balance of textures and colors.

Step 4: Mix and Pour the Creamy Sauce

In a separate bowl, whisk together the green onion cream cheese, chicken broth, and olive oil until smooth and luscious. Pour this velvety mixture evenly over the chicken, mushrooms, and spinach, ensuring each element will soak up the creamy flavor throughout baking.

Step 5: Bake to Perfection

Cover your dish loosely with foil—don’t seal it airtight—and bake for 20 minutes. This gentle steaming helps everything meld together without drying out. Then, remove the foil and bake uncovered for another 20 minutes to let the sauce thicken and the chicken finish cooking beautifully.

Step 6: Add the Mozzarella and Finish Baking

Sprinkle the shredded mozzarella evenly over the casserole and return it to the oven for 5 to 10 minutes. Watch as the cheese melts into a golden, bubbly layer that invites you in with its irresistible aroma and texture.

How to Serve Chicken Spinach and Mushroom Low-Carb Casserole

Garnishes

To elevate the presentation and flavor, sprinkle freshly chopped parsley or a bit of finely sliced green onion on top before serving. A light dusting of crushed red pepper flakes can also add a subtle kick that contrasts beautifully with the creamy casserole.

Side Dishes

This Chicken Spinach and Mushroom Low-Carb Casserole shines as a main dish paired with simple sides like a crisp garden salad, roasted asparagus, or steamed cauliflower rice. These low-carb companions keep the meal balanced and enhance the fresh, wholesome vibe.

Creative Ways to Present

For a special touch, try serving this casserole in individual ramekins or small baking dishes. This makes portion control a breeze and adds a charming, personalized element to your meal. You could even layer it with a sprinkle of fresh herbs between servings for a colorful presentation.

Make Ahead and Storage

Storing Leftovers

Once cooled, cover the casserole tightly with plastic wrap or store it in an airtight container. It will keep well in the refrigerator for 3 to 4 days, allowing you to enjoy this comforting dish for multiple meals without any hassle.

Freezing

This casserole freezes beautifully! Just make sure it’s completely cooled before transferring it to a freezer-safe container or heavy-duty zip-top bag. It can be frozen for up to 2 months. When you’re ready, thaw it overnight in the refrigerator for best results.

Reheating

Reheat leftovers in the oven at 350°F (175°C) for about 20 minutes or until heated through, which helps maintain the casserole’s lovely texture. If you’re short on time, the microwave works too—just cover the dish to keep moisture in and heat in short bursts, stirring in between.

FAQs

Can I use other types of cheese instead of mozzarella?

Absolutely! While mozzarella melts beautifully and has a mild flavor, you can experiment with cheddar, provolone, or even a sprinkle of Parmesan for a sharper taste. Just keep mozzarella as your base for that perfect gooey texture if possible.

Is this casserole suitable for meal prep?

Yes, the Chicken Spinach and Mushroom Low-Carb Casserole is excellent for meal prep. It holds up well in the fridge or freezer, and portions can be reheated easily, making it a practical and tasty option for busy weeks.

Can I make this recipe dairy-free?

You can modify the recipe by using dairy-free cream cheese and cheese alternatives. Choose plant-based cream cheeses and shredded cheeses designed to melt well to keep the creamy texture intact.

What if I don’t have Weber Herb and Garlic Seasoning?

No worries! You can substitute with a blend of dried herbs like thyme, rosemary, garlic powder, and onion powder. The key is to season the chicken well so the flavors shine through.

Can I add other vegetables to this casserole?

Definitely! Feel free to toss in zucchini slices, bell peppers, or even cauliflower florets to boost the veggie content and customize the casserole to your taste preferences.

Final Thoughts

This Chicken Spinach and Mushroom Low-Carb Casserole has become one of my absolute favorites because it’s both nourishing and indulgent without any complicated steps or ingredients. It’s a clear winner for anyone looking to enjoy a comforting, healthy, and crowd-pleasing meal. I can’t wait for you to try it and make it a staple in your kitchen—once you do, I promise it’ll keep popping up on your dinner table again and again.

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