Tender seasoned chicken, earthy mushrooms, and nutritious spinach are baked together in a creamy garlic-cheese sauce until bubbling and golden. This easy low-carb, high-protein casserole is perfect for a weeknight dinner or meal prep.
Recipe Details
Prep Time: 15 minutes
Cook Time: 35–40 minutes
Total Time: 50–55 minutes
Servings: 6
Difficulty: Easy
Ingredients
For the Chicken
1½ pounds boneless, skinless chicken breasts, cut into bite-size pieces
1 tablespoon olive oil
1 teaspoon Italian seasoning
½ teaspoon paprika
½ teaspoon garlic powder
½ teaspoon salt
¼ teaspoon black pepper
For the Vegetables
8 ounces mushrooms, sliced
5 ounces fresh baby spinach
½ medium yellow onion, finely diced
3 cloves garlic, minced
1 tablespoon olive oil or butter
For the Creamy Sauce
4 ounces cream cheese, softened
½ cup heavy cream
½ cup chicken broth
½ cup grated Parmesan cheese
1 cup shredded mozzarella cheese, divided
½ teaspoon Italian seasoning
¼ teaspoon black pepper
¼ teaspoon salt, or to taste
¼ teaspoon red pepper flakes, optional
Optional Garnish
2 tablespoons fresh parsley, chopped
1 tablespoon grated Parmesan
Fresh basil
Instructions
1. Preheat the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9 × 13-inch baking dish with olive oil or cooking spray.
2. Season the Chicken
Place the chicken pieces in a bowl.
Add:
Olive oil
Italian seasoning
Paprika
Garlic powder
Salt
Black pepper
Toss until the chicken is evenly coated.
3. Brown the Chicken
Heat a large skillet over medium-high heat.
Add the seasoned chicken and cook for approximately 4–5 minutes, stirring occasionally, until lightly browned on the outside.
The chicken does not need to be completely cooked at this point because it will finish cooking in the oven.
Transfer the chicken to a plate.
4. Cook the Mushrooms & Onion
Using the same skillet, add 1 tablespoon olive oil or butter.
Add the diced onion and sliced mushrooms.
Cook for 5–7 minutes, stirring occasionally, until the mushrooms are browned and most of their moisture has evaporated.
Add the minced garlic and cook for another 30 seconds.
5. Wilt the Spinach
Add the fresh spinach to the skillet.
Cook for 1–2 minutes, stirring frequently, until the spinach is wilted.
If there is excess liquid in the skillet, allow it to cook off.
Remove the skillet from the heat.
6. Make the Creamy Sauce
In a bowl, whisk together:
Softened cream cheese
Heavy cream
Chicken broth
Parmesan
½ cup mozzarella
Italian seasoning
Black pepper
Salt
Red pepper flakes, if using
Whisk until mostly smooth.
Small pieces of cream cheese are okay; they will melt during baking.
7. Assemble the Bake
Place the browned chicken into the prepared baking dish.
Add the mushroom, onion, and spinach mixture.
Pour the creamy sauce evenly over everything.
Gently toss to distribute the ingredients.
Sprinkle the remaining ½ cup mozzarella evenly over the top.
Add a little extra Parmesan if desired.
8. Bake
Cover the dish loosely with aluminum foil.
Bake for 20 minutes.
Remove the foil and continue baking for another 10–15 minutes, until:
The chicken is completely cooked
The sauce is bubbling
The cheese is melted and golden
The chicken should reach an internal temperature of 165°F (74°C).
For an extra-golden top, broil for 1–2 minutes at the end, watching closely.
9. Rest & Serve
Remove the casserole from the oven and let it rest for 5–10 minutes.
Garnish with fresh parsley or basil.
Serve warm.
What to Serve With It
Keep the meal low-carb with:
Roasted broccoli
Cauliflower rice
Zucchini noodles
Green beans
Asparagus
Cucumber salad
Mixed green salad
Roasted cauliflower
For a heartier meal, serve with rice, pasta, or crusty bread if those fit your eating plan.
Tips for the Best Chicken Bake
Don’t Overcook the Chicken
Cutting the chicken into evenly sized pieces helps everything cook at the same rate.
Brown the Mushrooms
Cook them until their moisture evaporates. This prevents a watery casserole and gives the mushrooms much more flavor.
Fresh or Frozen Spinach
Frozen spinach can be used, but thaw it completely and squeeze out excess liquid before adding it.
Use Freshly Grated Cheese
Freshly grated Parmesan and mozzarella generally melt more smoothly.
Adjust the Sauce
If the sauce seems too thick, add a splash of chicken broth. If it’s too thin after baking, allow the casserole to rest for several minutes—it will thicken as it cools.
Delicious Variations
Chicken Bacon Bake
Add 4–6 slices of cooked, crumbled bacon before baking.
Spicy Chicken Bake
Add jalapeños, cayenne, or extra red pepper flakes.
Mediterranean Version
Add sun-dried tomatoes, feta, oregano, and fresh basil.
Three-Cheese Version
Add a little provolone or Monterey Jack along with the mozzarella and Parmesan.
Lemon Garlic Version
Add 1 teaspoon lemon zest and 1 tablespoon fresh lemon juice to brighten the creamy sauce.
Broccoli Chicken Bake
Replace part of the mushrooms with lightly steamed broccoli.
Nut Information
This recipe is naturally peanut-free and tree-nut-free when made with the ingredients listed.
No nuts are required.
However, check labels on packaged ingredients such as:
Cream cheese
Parmesan
Mozzarella
Chicken broth
Seasoning blends
Cooking sprays
Some packaged foods may be produced in facilities that also process peanuts or tree nuts.
For a Strict Nut-Free Version
Use products labeled according to the allergy requirements you’re following and prevent cross-contact with nut-containing foods.
Almond milk or cashew cream is not necessary for this recipe; heavy cream provides the desired richness without adding nuts.
Frequently Asked Questions
1. Can I use chicken thighs?
Yes. Boneless, skinless chicken thighs work beautifully and remain particularly juicy. Cook until they reach 165°F (74°C).
2. Can I use frozen spinach?
Yes. Thaw it completely and squeeze it very dry before adding it to prevent excess liquid.
3. Can I make this without cream cheese?
Yes. Substitute an additional ½ cup heavy cream and ¼ cup extra Parmesan, although the sauce will be slightly less thick.
4. Can I use Greek yogurt instead of heavy cream?
You can replace part of the cream with plain Greek yogurt, but add it after removing the sauce from high heat to reduce the chance of curdling.
5. Is this recipe keto-friendly?
It can fit many low-carb or keto-style eating plans because it contains chicken, spinach, mushrooms, cheese, and a creamy sauce without flour, pasta, or rice. Exact carbohydrate content depends on the brands and quantities used.
6. Can I prepare it ahead of time?
Yes. Assemble the casserole, cover, and refrigerate for up to 24 hours before baking. Add a few extra minutes to the covered baking time if starting directly from the refrigerator.
7. How long do leftovers last?
Store leftovers in an airtight container in the refrigerator for 3–4 days.
8. Can I freeze it?
Yes, although cream sauces can sometimes change texture slightly after freezing. Cool completely, portion into freezer-safe containers, and use within about 2 months for best quality.
9. Why did my casserole turn watery?
The most common causes are mushrooms or spinach releasing excess moisture. Brown the mushrooms thoroughly and drain frozen spinach very well.
10. Can I add other vegetables?
Absolutely. Broccoli, zucchini, asparagus, bell peppers, and cauliflower all work well. Choose vegetables that don’t release excessive water during baking.
Final Serving Idea
Serve this bubbling Low-Carb Chicken, Spinach & Mushroom Bake straight from the oven with the golden mozzarella on top, a sprinkle of fresh parsley, and a side of roasted broccoli or crisp salad. It’s creamy, cheesy, satisfying, and packed with tender chicken and vegetables.
With years of experience in restaurant research and local SEO, Sara creates accurate, user-friendly guides that work for both people and search engines. Her goal is to help users go from search results to their nearest restaurant or menu choice with as few clicks as possible.
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