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Creamy Chicken and Spinach Casserole

A rich and comforting casserole with tender chicken, fresh spinach, and a creamy cheese sauce — perfect for weeknight dinners.
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Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Servings: 6 servings
Course: Dessert, Snack
Cuisine: American, Autumn
Calories: 340

Ingredients
  

Casserole Filling
  • 2 tbsp olive oil
  • 1 medium onion diced
  • 3 cloves garlic minced
  • 2 cups cooked chicken shredded
  • 3 cups fresh spinach or 1½ cups frozen, drained
  • 1 tsp salt
  • 0.5 tsp black pepper
  • 0.5 tsp dried thyme
  • 0.25 tsp red pepper flakes optional
  • 2 tbsp all-purpose flour
  • 1.5 cups milk
  • 0.5 cup chicken broth
  • 0.5 cup sour cream
  • 1.5 cups mozzarella cheese shredded
  • 0.5 cup Parmesan cheese grated
Optional
  • 1 cup cooked pasta or rice
  • 0.5 cup breadcrumbs
  • 2 tbsp butter melted

Equipment

  • Mixing bowls
  • Baking sheet
  • Wire rack
  • Hand mixer or stand mixer

Method
 

  1. Preheat oven to 375°F (190°C) and grease your baking dish.
  2. Heat olive oil, sauté onions until soft, then add garlic and cook another minute.
  3. Add spinach and cook until wilted. Season with salt, pepper, thyme, and pepper flakes.
  4. Sprinkle flour, stir well, then slowly add milk and broth. Simmer until thick.
  5. Add sour cream, mozzarella, and half the Parmesan. Stir until smooth.
  6. Fold in cooked chicken. Layer pasta or rice in baking dish if using, then pour mixture on top.
  7. Mix breadcrumbs, butter, and remaining Parmesan. Sprinkle over the top.
  8. Bake for 20–25 minutes until golden and bubbly. Rest 5 minutes before serving.

Notes

Use rotisserie chicken for a shortcut. Add mushrooms or broccoli for variation.