Garlic Baked Tuscan Chicken Casserole

If you ask me, baked chicken casseroles are pure comfort food magic.

This hearty Tuscan-inspired dish brings together tender chicken with creamy sauce and Italian herbs. Sun-dried tomatoes and spinach add earthy flavors that pair perfectly with the rich, cheesy base.

The chicken bakes right in the casserole dish with garlic, basil, and a touch of cream that creates the most satisfying sauce. Melted mozzarella and Parmesan cheese help tie everything together.

It’s a cozy weeknight dinner that feels fancy enough for company, perfect when you want something warm and filling.

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What Kind of Chicken Should I Use?

For this casserole, boneless skinless chicken breasts are your best bet since they cook evenly and slice nicely when you cut them horizontally. You can absolutely use chicken thighs if that’s what you have on hand – they’ll add extra flavor and stay really juicy during baking. If you’re using thighs, just make sure they’re boneless and skinless, and you might need to adjust the cooking time slightly since thighs can take a bit longer. When slicing your chicken breasts horizontally, aim for pieces that are about the same thickness so everything cooks at the same rate.

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Options for Substitutions

This creamy Tuscan chicken casserole is pretty forgiving when it comes to swaps:

• Chicken breast: Chicken thighs work great here and actually stay more tender during baking. You can also use leftover rotisserie chicken – just shred it and reduce the baking time by about 10 minutes.
• Frozen spinach: Fresh spinach works too – you’ll need about 5 cups of fresh leaves. Sauté them first until wilted, then squeeze out the excess water. You can also try chopped kale or Swiss chard.
• Heavy cream: Half-and-half or whole milk will work, though the sauce won’t be quite as rich. If using milk, add an extra tablespoon of cream cheese to help thicken things up.
• Sun-dried tomatoes: If you can’t find them, try chopped cherry tomatoes or regular diced tomatoes (drain them well first). You could also use roasted red peppers for a different flavor.
• Mozzarella cheese: Monterey Jack, provolone, or even sharp cheddar will melt nicely. Just keep the same amount.
• Italian seasoning: Make your own with equal parts dried basil, oregano, and thyme if you don’t have the blend on hand.

Watch Out for These Mistakes While Baking

The biggest mistake with this Tuscan chicken casserole is not properly draining the spinach, which can make your dish watery and prevent the creamy sauce from setting correctly – squeeze that thawed spinach in a clean kitchen towel until no more liquid comes out.

Another common error is overcooking the chicken, so use a meat thermometer to ensure it reaches 165°F and no higher, since the lean breast meat will continue cooking in the hot casserole even after you remove it from the oven.

Don’t forget to slice your chicken breasts horizontally to create thinner pieces that cook more evenly, and make sure your cream cheese is fully softened before mixing to avoid lumpy sauce.

For the best flavor, let the casserole rest for about 10 minutes after baking, which allows the sauce to thicken slightly and makes serving much cleaner.

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What to Serve With Baked Tuscan Chicken Casserole?

This rich and creamy casserole pairs beautifully with simple sides that won’t compete with all those amazing Italian flavors. I love serving it over fluffy rice or creamy mashed potatoes to soak up that delicious sauce, or you can go the pasta route with some penne or rigatoni. A crisp Caesar salad or simple arugula salad with lemon dressing helps cut through the richness of the cream cheese and mozzarella. Don’t forget some crusty garlic bread or focaccia on the side – it’s perfect for getting every last bit of that creamy Tuscan goodness!

Storage Instructions

Refrigerate: This Tuscan chicken casserole keeps really well in the fridge for up to 4 days. Just cover it tightly with foil or transfer leftovers to an airtight container. The creamy sauce actually gets even more flavorful after a day or two, so don’t be surprised if it tastes even better as leftovers!

Freeze: You can freeze this casserole for up to 3 months, which makes it perfect for meal prep. Let it cool completely first, then wrap it well in plastic wrap and foil, or portion it out into freezer-safe containers. I like to write the date on top so I don’t forget when I made it.

Reheat: To warm up your leftovers, cover with foil and bake at 350°F for about 15-20 minutes until heated through. If reheating from frozen, thaw it overnight in the fridge first, then reheat as usual. You can also microwave individual portions on medium power, stirring halfway through to heat evenly.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 1400-1550
• Protein: 125-140 g
• Fat: 90-100 g
• Carbohydrates: 35-42 g

Ingredients

For the chicken:

• 1 lb boneless, skinless chicken breasts (about 2, sliced horizontally)
• 1/4 tsp salt
• 1/4 tsp black pepper
• 2 cloves garlic, minced

For the creamy spinach topping:

• 6 oz frozen spinach, thawed and drained
• 3 oz cream cheese, at room temperature
• 1/3 cup heavy cream
• 3/4 cup shredded mozzarella
• 1/3 cup grated parmesan
• 2 cloves garlic, minced
• 1/2 tsp onion powder
• 1/4 tsp chili powder
• 1 tsp italian seasoning

For assembly and finishing:

• 8 oz sun-dried tomatoes, drained and chopped (reserve 1 tbsp oil)
• 1 tbsp reserved oil from sun-dried tomatoes
• 1 tbsp chopped fresh parsley

Step 1: Preheat Oven and Prepare Chicken

• 1 lb boneless, skinless chicken breasts (about 2, sliced horizontally)
• 1/4 tsp salt
• 1/4 tsp black pepper
• 2 cloves garlic, minced (half used here)

Preheat your oven to 400ºF (200ºC).

Lay the sliced boneless, skinless chicken breasts flat in a large baking dish.

Season the chicken breasts evenly with 1/4 teaspoon salt, 1/4 teaspoon black pepper, and half of the minced garlic.

Make sure the seasonings are distributed well over the surface of the chicken.

Step 2: Make the Spinach and Cheese Filling

• 6 oz frozen spinach, thawed and drained
• 3 oz cream cheese, at room temperature
• 1/3 cup heavy cream
• 2 cloves garlic, minced (remaining half used here)
• 1/2 tsp onion powder
• 1/4 tsp chili powder
• 1 tsp Italian seasoning
• a pinch salt
• a pinch black pepper

In a medium bowl, combine the thawed and drained spinach, 3 oz cream cheese at room temperature, and 1/3 cup heavy cream.

Add the remaining minced garlic, 1/2 tsp onion powder, 1/4 tsp chili powder, 1 tsp Italian seasoning, a pinch of salt, and a pinch of black pepper (take these pinches from your existing measurements for nuanced flavor).

Mix thoroughly until the fillings are creamy and well blended.

Step 3: Add Cheese and Assemble Casserole

• 1/3 cup grated parmesan
• 3/4 cup shredded mozzarella (half used here, half reserved for topping)
• 8 oz sun-dried tomatoes, drained and chopped
• 1 tbsp reserved oil from sun-dried tomatoes
• Spinach and cheese filling from Step 2
• Seasoned chicken breasts from Step 1

Stir 1/3 cup grated parmesan and half of the shredded mozzarella into the creamy spinach mixture from Step 2.

Once mixed, spread the filling evenly over the seasoned chicken breasts from Step 1 in the baking dish.

Top with the chopped sun-dried tomatoes, then drizzle 1 tablespoon of reserved oil from the sun-dried tomatoes evenly over everything.

Finally, sprinkle the remaining mozzarella cheese on top for a nice golden finish when baked.

I like to reserve some extra mozzarella to sprinkle just before baking for an extra cheesy crust.

Step 4: Bake the Casserole

Cover the baking dish loosely with foil and place it in the preheated oven.

Bake for 20 minutes.

Then, remove the foil and continue baking for another 15 minutes, or until the chicken is fully cooked through and the casserole is golden and bubbly.

The chicken should reach an internal temperature of 165ºF (71ºC) for safe consumption.

Step 5: Garnish and Serve

• 1 tbsp chopped fresh parsley

Remove the casserole from the oven and allow it to cool for a few minutes.

Garnish with freshly chopped parsley just before serving.

I like to add a squeeze of fresh lemon juice for brightness if I have one on hand.

Serve the Tuscan chicken casserole hot, perhaps with cauliflower rice or zucchini noodles for a lighter side.

Garlic Baked Tuscan Chicken Casserole

Delicious Garlic Baked Tuscan Chicken Casserole recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 42 minutes mins

Total Time 1 hour hr 2 minutes mins

Servings 4

Calories 1475 kcal

Ingredients

  

For the chicken:

• 1 lb boneless, skinless chicken breasts (about 2, sliced horizontally)
• 1/4 tsp salt
• 1/4 tsp black pepper
• 2 cloves garlic, minced

For the creamy spinach topping:

• 6 oz frozen spinach, thawed and drained
• 3 oz cream cheese, at room temperature
• 1/3 cup heavy cream
• 3/4 cup shredded mozzarella
• 1/3 cup grated parmesan
• 2 cloves garlic, minced
• 1/2 tsp onion powder
• 1/4 tsp chili powder
• 1 tsp Italian seasoning

For assembly and finishing:

• 8 oz sun-dried tomatoes, drained and chopped (reserve 1 tbsp oil)
• 1 tbsp reserved oil from sun-dried tomatoes
• 1 tbsp chopped fresh parsley

Instructions

 

• Preheat your oven to 400ºF (200ºC). Lay the sliced boneless, skinless chicken breasts flat in a large baking dish. Season the chicken breasts evenly with 1/4 teaspoon salt, 1/4 teaspoon black pepper, and half of the minced garlic. Make sure the seasonings are distributed well over the surface of the chicken.
• In a medium bowl, combine the thawed and drained spinach, 3 oz cream cheese at room temperature, and 1/3 cup heavy cream. Add the remaining minced garlic, 1/2 tsp onion powder, 1/4 tsp chili powder, 1 tsp Italian seasoning, a pinch of salt, and a pinch of black pepper (take these pinches from your existing measurements for nuanced flavor). Mix thoroughly until the fillings are creamy and well blended.
• Stir 1/3 cup grated parmesan and half of the shredded mozzarella into the creamy spinach mixture from Step 2. Once mixed, spread the filling evenly over the seasoned chicken breasts from Step 1 in the baking dish. Top with the chopped sun-dried tomatoes, then drizzle 1 tablespoon of reserved oil from the sun-dried tomatoes evenly over everything. Finally, sprinkle the remaining mozzarella cheese on top for a nice golden finish when baked. I like to reserve some extra mozzarella to sprinkle just before baking for an extra cheesy crust.
• Cover the baking dish loosely with foil and place it in the preheated oven. Bake for 20 minutes. Then, remove the foil and continue baking for another 15 minutes, or until the chicken is fully cooked through and the casserole is golden and bubbly. The chicken should reach an internal temperature of 165ºF (71ºC) for safe consumption.
• Remove the casserole from the oven and allow it to cool for a few minutes. Garnish with freshly chopped parsley just before serving. I like to add a squeeze of fresh lemon juice for brightness if I have one on hand. Serve the Tuscan chicken casserole hot, perhaps with cauliflower rice or zucchini noodles for a lighter side.