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Overhead shot of a creamy and delicious Chicken And Spinach Casserole, perfect for a comforting dinner.

Easy Chicken and Spinach Casserole

This Easy Chicken and Spinach Casserole is a comforting and delicious dish perfect for weeknight dinners. Tender chicken and vibrant spinach are combined in a creamy, cheesy sauce and baked to bubbly perfection. It's a simple yet satisfying meal that the whole family will enjoy.
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Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Servings: 6
Course: Main Course
Cuisine: American
Calories: 450
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5 lbs boneless, skinless chicken breasts, cooked and shredded
  • 1 tablespoon olive oil
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon garlic powder
  • 1 tablespoon butter
  • 1/2 cup chopped onion
  • 2 cloves garlic, minced
  • 1/4 cup all-purpose flour
  • 2 cups milk
  • 1/4 teaspoon nutmeg
  • Salt to taste
  • Pepper to taste
  • 1 cup shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1/4 cup bread crumbs optional
  • 1 tablespoon melted butter optional

Equipment

  • 9x13-inch baking dish
  • large skillet
  • mixing bowls
  • measuring cups and spoons
  • whisk
  • spatula
  • Kitchen towel

Method
 

  1. Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
  2. In a large skillet over medium heat, melt the butter. Add the chopped onion and cook until softened, about 5 minutes. Add the minced garlic and cook for another minute until fragrant.
  3. Sprinkle the flour over the onion and garlic mixture and cook for 1 minute, stirring constantly. Gradually whisk in the milk, making sure to smooth out any lumps.
  4. Bring the mixture to a simmer, stirring constantly, until it thickens slightly. This usually takes about 3-5 minutes. Season with nutmeg, salt, and pepper to taste.
  5. Stir in the squeezed-dry spinach and shredded chicken into the cream sauce. Mix well to combine everything evenly.
  6. Pour the chicken and spinach mixture into the prepared baking dish. Spread it out evenly.
  7. Sprinkle the mozzarella and Parmesan cheese evenly over the top of the casserole. If using, mix the bread crumbs with the melted butter and sprinkle over the cheese.
  8. Bake in the preheated oven for 20-25 minutes, or until the casserole is bubbly and the cheese is melted and golden brown.
  9. Remove the casserole from the oven and let it rest for about 5-10 minutes before serving.

Notes

For a richer flavor, use heavy cream instead of milk. You can assemble the casserole ahead of time and store it in the refrigerator for up to 24 hours before baking. Add a few extra minutes to the baking time if baking from chilled. To prevent a runny casserole, ensure the spinach is thoroughly squeezed dry. Variations: Swap the protein for turkey, ham, or ground beef. Add vegetables like mushrooms, bell peppers, or broccoli. Experiment with different cheeses like Gruyere, cheddar, or provolone. Add a pinch of red pepper flakes for a little kick. For a gluten-free version, use gluten-free flour and bread crumbs.