Creamy Chicken Mushroom Casserole
A comforting, creamy casserole loaded with tender chicken, savory mushrooms, a rich cheese sauce, and topped with a golden, bubbly crust. This easy one-pan meal is perfect for busy weeknights, family dinners, or meal prep.
Prep Time: 20 minutes
Cook Time: 35–40 minutes
Total Time: 1 hour
Servings: 6
Ingredients
For the Chicken
2 lbs (900g) boneless, skinless chicken breasts or thighs, cut into bite-sized pieces
1 tablespoon olive oil
1 teaspoon salt
½ teaspoon black pepper
1 teaspoon garlic powder
1 teaspoon onion powder
1 teaspoon Italian seasoning
½ teaspoon paprika
For the Mushroom Sauce
2 tablespoons butter
8 oz (225g) mushrooms, sliced
1 small onion, finely chopped
3 garlic cloves, minced
2 tablespoons all-purpose flour
1½ cups chicken broth
1 cup heavy cream
4 oz (115g) cream cheese, softened
1 teaspoon Dijon mustard (optional)
½ teaspoon thyme
Salt and pepper to taste
For the Topping
1½ cups shredded mozzarella cheese
½ cup grated Parmesan cheese
2 tablespoons chopped fresh parsley
Optional Crunchy Topping
½ cup panko breadcrumbs
2 tablespoons melted butter
Instructions
Step 1: Prepare the Chicken
Preheat oven to 375°F (190°C).
Season the chicken with salt, pepper, garlic powder, onion powder, paprika, and Italian seasoning.
Heat olive oil in a large skillet over medium-high heat.
Cook the chicken for 5–6 minutes until lightly browned (it does not need to be fully cooked).
Remove and set aside.
Step 2: Make the Mushroom Sauce
In the same skillet, melt the butter.
Add onions and cook for 3 minutes.
Stir in mushrooms and cook for 6–8 minutes until browned.
Add garlic and cook for 30 seconds.
Sprinkle flour over the mushrooms and stir for 1 minute.
Slowly whisk in chicken broth until smooth.
Add heavy cream, cream cheese, Dijon mustard, and thyme.
Simmer for 4–5 minutes until thick and creamy.
Season with salt and pepper to taste.
Step 3: Assemble the Casserole
Place the chicken in a greased 9×13-inch baking dish.
Pour the mushroom sauce evenly over the chicken.
Sprinkle mozzarella and Parmesan cheese on top.
If using, combine panko breadcrumbs with melted butter and sprinkle over the cheese.
Step 4: Bake
Bake for 30–35 minutes, or until the chicken reaches 165°F (74°C) internally and the cheese is melted and golden.
Broil for 2–3 minutes for a crispier top, if desired.
Garnish with fresh parsley before serving.
Serving Suggestions
Serve with:
Mashed potatoes
Buttered egg noodles
Steamed rice
Roasted vegetables
Garlic bread
Green beans
Caesar salad
Roasted asparagus
Cauliflower mash (low-carb option)
Storage
Refrigerator: Store in an airtight container for up to 4 days.
Freezer: Freeze in a freezer-safe container for up to 3 months. Thaw overnight in the refrigerator before reheating.
Nutrition (Approximate Per Serving)
Calories: 470
Protein: 39g
Carbohydrates: 9g
Fiber: 1g
Fat: 31g
Saturated Fat: 14g
Calcium: 20% DV
Nutrition values are estimates and may vary depending on ingredients used.
About Nuts
This casserole is naturally nut-free and contains no tree nuts or peanuts.
Nut Information
Although nuts are not used in this recipe, they are nutritious foods that can be enjoyed separately or in salads served alongside the casserole.
Almonds
High in vitamin E
Rich in magnesium
Good source of protein and fiber
Contain heart-healthy monounsaturated fats
Walnuts
Excellent source of plant-based omega-3 fatty acids (ALA)
Rich in antioxidants
Support heart and brain health
Pistachios
High in protein and fiber
Rich in potassium and vitamin B6
Lower in calories than many other nuts
Cashews
Good source of copper, magnesium, and zinc
Creamy texture makes them popular in dairy-free sauces
Allergy Note: This recipe is nut-free, but always check packaged ingredients such as breadcrumbs, chicken broth, and cheese for allergen information if serving someone with severe food allergies.
Health Benefits
High in protein from chicken
Mushrooms provide B vitamins, selenium, and antioxidants
Dairy adds calcium and protein
Garlic and onions contribute beneficial plant compounds
A satisfying, comforting meal that can be paired with vegetables for a balanced dinner
Recipe Tips
Brown the chicken before baking for extra flavor.
Don’t overcrowd the mushrooms while cooking so they brown instead of steam.
Use freshly grated cheese for the smoothest melt.
Let the casserole rest for 5–10 minutes before serving to allow the sauce to thicken.
Add spinach or broccoli for extra vegetables.
Variations
Low-Carb Version
Skip the breadcrumb topping and serve with cauliflower rice or mashed cauliflower.
Bacon Chicken Mushroom Casserole
Add 6 slices of cooked, crumbled bacon to the sauce.
Spinach Version
Stir in 2 cups of fresh spinach before baking.
Broccoli Chicken Casserole
Add 2 cups of steamed broccoli florets to the baking dish.
Spicy Version
Add red pepper flakes or diced jalapeños for extra heat.
Frequently Asked Questions (Q&A)
Q: Can I use rotisserie chicken?
A: Yes. Use about 4 cups of shredded cooked chicken and reduce the baking time to 20–25 minutes.
Q: Can I make this ahead of time?
A: Absolutely. Assemble the casserole, cover, and refrigerate for up to 24 hours before baking.
Q: Can I use different mushrooms?
A: Yes. Cremini, baby bella, shiitake, or a mix of mushrooms all work well.
Q: Can I freeze the casserole?
A: Yes. Freeze before or after baking for up to 3 months. Thaw overnight in the refrigerator before reheating.
Q: What cheeses work best?
A: Mozzarella, Parmesan, Monterey Jack, Gruyère, Swiss, or sharp cheddar are all excellent choices.
Q: Is this recipe gluten-free?
A: Not as written because of the flour and optional breadcrumbs. Use gluten-free flour and gluten-free breadcrumbs to make it gluten-free.
Q: Can I add vegetables?
A: Yes. Broccoli, spinach, peas, bell peppers, or asparagus are delicious additions.
Q: Is this recipe suitable for meal prep?
A: Yes. It reheats well, making it a great option for lunches or dinners throughout the week.
