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Chicken Florentine Casserole Recipe

A creamy, cheesy Chicken Florentine Casserole made with tender chicken, spinach, and a rich Parmesan sauce baked to golden perfection.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 6
Course: Dinner, Main Course
Cuisine: American, Italian
Ingredients Method

Ingredients
  

For the Chicken Mixture
  • 3 cups cooked chicken breast shredded or cubed (rotisserie chicken works well)
  • 2 tablespoons olive oil or butter
  • 1 small onion finely chopped
  • 3 cloves garlic minced
  • 3 cups fresh spinach or 1 ½ cups frozen spinach, thawed and drained
  • 1 cup mushrooms sliced (optional but delicious)
For the Sauce
  • 2 tablespoons butter
  • 2 tablespoons all-purpose flour
  • 1 ½ cups milk whole milk preferred
  • ½ cup chicken broth
  • ½ cup sour cream or Greek yogurt
  • ½ cup cream cheese softened
  • ½ cup grated Parmesan cheese
  • 1 teaspoon Italian seasoning
  • ½ teaspoon salt adjust to taste
  • ¼ teaspoon black pepper
  • Pinch of nutmeg optional
For the Topping
  • 1 cup shredded mozzarella or Swiss cheese
  • ½ cup breadcrumbs plain or panko
  • 1 tablespoon melted butter

Method
 

  1. Preheat the oven to 375°F (190°C).
  2. Grease a 9x13-inch baking dish with butter or cooking spray.
  3. Heat olive oil in a skillet over medium heat.
  4. Add the chopped onion and cook until soft.
  5. Add the garlic and mushrooms. Cook for 2–3 minutes.
  6. Stir in the spinach and cook until wilted. Set aside.
  7. In a saucepan, melt butter over medium heat.
  8. Add flour and whisk for 1 minute.
  9. Slowly pour in the milk and chicken broth while whisking.
  10. Stir until the sauce becomes smooth and thick.
  11. Add sour cream, cream cheese, and Parmesan cheese.
  12. Stir until the cheese melts and the sauce is creamy.
  13. Add Italian seasoning, salt, pepper, and nutmeg. Mix well.
  14. In a large bowl, combine the cooked chicken, spinach mixture, and sauce.
  15. Pour the mixture into the baking dish.
  16. Sprinkle mozzarella cheese on top.
  17. Mix breadcrumbs with melted butter and spread over the cheese.
  18. Bake for 25–30 minutes, until the top is golden and bubbly.
  19. Let it cool for 5 minutes before serving.
  20. Garnish with parsley or extra Parmesan, if desired.