A creamy, cheesy, protein-rich chicken casserole loaded with tender chicken, earthy mushrooms, fresh spinach, garlic, and Italian herbs. It is easy enough for a weeknight dinner but comforting enough for a family meal.
Ingredients
Chicken
1½ lb (680 g) boneless, skinless chicken breasts
1 tablespoon olive oil
½ teaspoon salt
½ teaspoon black pepper
1 teaspoon Italian seasoning
½ teaspoon garlic powder
½ teaspoon paprika
Vegetables
8 oz (225 g) mushrooms, sliced
5 oz (140 g) fresh baby spinach
1 small yellow onion, finely diced
3 cloves garlic, minced
1 tablespoon olive oil
Creamy Sauce
4 oz (115 g) cream cheese, softened
½ cup plain Greek yogurt
½ cup low-sodium chicken broth
½ cup heavy cream
½ cup grated Parmesan cheese
1 teaspoon Italian seasoning
½ teaspoon garlic powder
¼ teaspoon black pepper
¼ teaspoon salt, or to taste
½ teaspoon lemon juice
Cheese Topping
1 cup shredded mozzarella
¼ cup grated Parmesan
1 tablespoon chopped fresh parsley
Equipment
9×13-inch baking dish
Large skillet
Cutting board
Sharp knife
Mixing bowl
Wooden spoon or spatula
Aluminum foil
Instructions
1. Prepare 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. Prepare the Chicken
Pat the chicken breasts dry with paper towels.
If the breasts are very thick, slice them horizontally or pound them gently so they have an even thickness.
Season both sides with:
Salt
Black pepper
Italian seasoning
Garlic powder
Paprika
3. Sear the Chicken
Heat 1 tablespoon olive oil in a large skillet over medium-high heat.
Add the chicken.
Cook for approximately 3–4 minutes per side, just until lightly golden.
The chicken does not need to be fully cooked at this point because it will finish cooking in the oven.
Transfer the chicken to a plate.
4. Sauté the Vegetables
Add another tablespoon of olive oil to the same skillet.
Add the diced onion and sliced mushrooms.
Cook for approximately 5–7 minutes, stirring occasionally.
The mushrooms should release their moisture and begin to brown.
Add the minced garlic and cook for another 30–60 seconds.
5. Add the Spinach
Add the fresh spinach to the skillet.
Cook for approximately 1–2 minutes, stirring until the spinach wilts.
If the spinach releases excess water, continue cooking for another minute so the mixture isn’t watery.
Remove the skillet from the heat.
6. Make the Creamy Sauce
In a mixing bowl, combine:
Cream cheese
Greek yogurt
Chicken broth
Heavy cream
Parmesan
Italian seasoning
Garlic powder
Black pepper
Salt
Lemon juice
Whisk until smooth.
A few small cream-cheese lumps are fine; they will melt during baking.
7. Combine Everything
Spread approximately half of the mushroom and spinach mixture across the bottom of the baking dish.
Place the seared chicken breasts over the vegetables.
Pour the creamy sauce evenly over the chicken.
Add the remaining mushrooms, spinach, and onion around the chicken.
8. Add the Cheese
Sprinkle evenly with:
1 cup mozzarella
¼ cup Parmesan
Make sure the cheese covers the top reasonably evenly.
9. Bake
Cover the baking dish loosely with aluminum foil.
Bake for approximately 20 minutes.
Remove the foil and continue baking for another 10–15 minutes, until:
The cheese is melted and golden.
The sauce is bubbling.
The chicken reaches an internal temperature of 165°F (74°C) at the thickest point.
For a more golden top, broil for 1–2 minutes, watching carefully.
10. Rest and Garnish
Remove the casserole from the oven.
Let it rest for 5–10 minutes.
Sprinkle with fresh parsley.
Serve warm.
Nutrition Information
Approximate per serving, based on 6 servings:
Calories: 430–470 kcal
Protein: 43–48 g
Total Fat: 25–28 g
Saturated Fat: 12–14 g
Carbohydrates: 8–10 g
Fiber: 1–2 g
Net Carbs: approximately 7–8 g
Sugar: 3–4 g
Sodium: 650–750 mg
Calcium: approximately 300–350 mg
Nutrition varies depending on the chicken size, cheese, cream, and broth used.
Nut Information
Does this recipe contain nuts?
No.
The standard recipe contains:
No almonds
No walnuts
No pecans
No pistachios
No cashews
No peanuts
No coconut
Nut-free status
The recipe is nut-free based on the listed ingredients.
However, if preparing this for someone with a serious nut allergy, check packaged products such as:
Cream cheese
Greek yogurt
Parmesan
Mozzarella
Chicken broth
Seasonings
for allergen statements and possible cross-contact.
Dietary Information
High protein: Yes
Low carb: Yes
Keto-friendly: Yes
Gluten-free: Yes, when using certified gluten-free packaged ingredients
Nut-free: Yes
Vegetarian: No
Mediterranean-inspired: Yes
Dairy-free: No
Egg-free: Yes
Refined-flour-free: Yes
Tips for the Best Chicken Bake
Don’t overcook the chicken
Chicken breast can become dry if cooked too long. Use a thermometer and remove it when the thickest portion reaches 165°F (74°C).
Brown the mushrooms
Allow the mushrooms to brown rather than simply steaming them. This creates much deeper flavor.
Remove excess moisture
Mushrooms and spinach both release water. Cooking them before assembling the casserole helps prevent a watery sauce.
Use freshly grated Parmesan
Freshly grated Parmesan generally melts more smoothly than pre-shredded varieties.
Let it rest
Resting for 5–10 minutes allows the sauce to thicken slightly and makes serving easier.
Variations
Extra-Cheesy Version
Add:
½ cup extra mozzarella
¼ cup shredded cheddar
Sprinkle both over the top before baking.
Mediterranean Version
Add:
¼ cup chopped sun-dried tomatoes
¼ cup Kalamata olives
1 teaspoon dried oregano
Fresh basil
The sun-dried tomatoes add a delicious sweet-tangy flavor.
Lemon Garlic Version
Add:
1 extra garlic clove
1 teaspoon lemon zest
1 tablespoon fresh lemon juice
Finish with fresh parsley.
High-Protein Version
Use:
Extra chicken breast
Low-fat Greek yogurt instead of some of the heavy cream
You can also increase the spinach and mushrooms for additional volume and fiber.
Low-Carb Version
The recipe is already low-carb.
For an even lower-carb version:
Replace the onion with a smaller amount.
Use unsweetened full-fat Greek yogurt.
Avoid serving it with bread, pasta, or rice.
Make-Ahead Instructions
You can prepare the casserole up to 24 hours ahead.
Assemble everything except the final cheese topping.
Cover and refrigerate.
When ready to bake, allow the dish to sit at room temperature for approximately 15–20 minutes.
Add the mozzarella and Parmesan, then bake.
Because the casserole starts cold, it may need an additional 10–15 minutes in the oven.
Storage
Store leftovers in an airtight container in the refrigerator for 3–4 days.
Reheating in the oven
Cover with foil and heat at 350°F (175°C) until hot.
Microwave
Heat individual portions for approximately 1½–3 minutes, depending on your microwave.
Add a tablespoon of broth or water if the sauce becomes too thick.
Freezing
This casserole can be frozen, although the creamy sauce may change texture slightly after thawing.
For best results:
Cool completely.
Portion into freezer-safe containers.
Freeze for up to 2 months.
Thaw overnight in the refrigerator.
Reheat covered at 350°F (175°C).
Frequently Asked Questions
Q: Can I use chicken thighs?
Yes. Boneless, skinless chicken thighs work very well and are usually more forgiving than chicken breasts.
Q: Can I use frozen spinach?
Yes. Thaw it completely and squeeze out as much water as possible before adding it.
Q: Can I use frozen mushrooms?
Fresh mushrooms are preferable, but frozen mushrooms can work if thawed and drained thoroughly.
Q: Can I replace heavy cream?
Yes. You can use additional Greek yogurt, half-and-half, or evaporated milk.
Q: Can I use milk instead of heavy cream?
Yes, but the sauce will be less rich and slightly thinner.
Q: Can I skip the cream cheese?
Yes. Increase the Greek yogurt slightly and add a little extra Parmesan, although the sauce will be less creamy.
Q: Can I make this without cheese?
Yes, but it will no longer have the same creamy cheesy character. You can use a dairy-free cheese alternative if needed.
Q: Why is my casserole watery?
The most common reason is excess moisture from mushrooms or spinach. Cook the vegetables thoroughly and drain frozen spinach very well.
Q: Can I add broccoli?
Yes. Add approximately 1½ cups small broccoli florets. Blanch them briefly first for the best texture.
Q: Can I add bacon?
Yes. Cook and crumble 4–6 slices of bacon, then sprinkle it over the casserole before adding the cheese.
Q: Can I add pasta?
Yes. Stir in about 2 cups cooked pasta before baking. You may need to increase the sauce slightly.
Q: Can I serve this with rice?
Absolutely. It pairs particularly well with brown rice, cauliflower rice, quinoa, or roasted potatoes.
Q: Is this suitable for meal prep?
Yes. It reheats well and can be divided into individual containers for several meals.
Q: How do I know when the chicken is done?
Use a food thermometer. The thickest part of the chicken should reach 165°F (74°C).
Q: Can I make this in a slow cooker?
Yes, but the creamy sauce and cheese are better suited to oven baking. For a slow-cooker version, add dairy ingredients toward the end to reduce the chance of curdling.
Serving Suggestions
Serve this creamy chicken bake with:
Roasted broccoli
Green salad
Cauliflower rice
Quinoa
Roasted asparagus
Garlic green beans
Crusty bread
Brown rice
For a low-carb dinner, serve it with roasted vegetables or cauliflower rice.
Servings: 6
Prep Time: 20 minutes
Cook Time: 40–50 minutes
Resting Time: 5–10 minutes
Total Time: Approximately 1 hour 10 minutes.
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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