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French Onion Chicken Orzo Casserole

A warm and comforting dish combining rich caramelized onions, tender chicken, and creamy orzo pasta, perfect for busy weeknights or cozy dinners.
Print Recipe
Prep Time 15 minutes
Cook Time 50 minutes
Total Time 1 hour 5 minutes
Course Dinner, Main Course
Cuisine American, Comfort Food
Servings 6 servings
Calories 500 kcal

Ingredients
  

For the Onion Mixture

  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 large yellow onions, thinly sliced
  • 1 teaspoon sugar
  • 1/2 teaspoon salt
  • 3 cloves garlic, minced

For the Casserole

  • 1 1/2 cups orzo pasta
  • 2 cups cooked shredded chicken (rotisserie works well)
  • 1/2 teaspoon dried thyme
  • 1/4 teaspoon black pepper
  • 2 cups low-sodium chicken broth
  • 1 cup heavy cream (or half and half for lighter option)
  • 1 1/2 cups shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1/2 teaspoon Worcestershire sauce or balsamic glaze (optional, for added depth)

Instructions
 

Caramelize the Onions

  • In a large oven-safe skillet or Dutch oven, melt the butter and olive oil over medium heat.
  • Add the sliced onions, sugar, and salt.
  • Cook for 20–25 minutes, stirring occasionally, until the onions are deeply golden and caramelized.
  • Stir in the minced garlic during the last 1–2 minutes.

Add Orzo and Chicken

  • Stir in the orzo and cook for 2 minutes, allowing it to lightly toast.
  • Add the shredded chicken, thyme, pepper, and Worcestershire sauce if using. Mix well.

Pour in Liquids

  • Add the chicken broth and cream.
  • Bring to a gentle simmer. Reduce heat to low, cover, and let it cook for 8–10 minutes, stirring occasionally, until the orzo is tender.

Add Cheese

  • Stir in 1 cup of mozzarella and the Parmesan cheese.
  • Mix until melted and creamy.

Bake the Casserole

  • Preheat the oven to 375°F (190°C).
  • Sprinkle the remaining 1/2 cup of mozzarella over the top.
  • Bake uncovered for 10–15 minutes until bubbly and golden on top.

Serve

  • Let it rest for 5–10 minutes before serving.
  • Garnish with fresh thyme or parsley if desired.

Notes

To store leftovers, let the casserole cool completely. Place it in an airtight container and refrigerate for up to 3 days. You can also freeze it for up to 2 months. To reheat, thaw in the refrigerator overnight and warm in the oven or microwave until heated through. Take your time while caramelizing the onions for better sweetness.
Keyword Casserole, chicken recipes, Comfort Food, French Onion Chicken Orzo Casserole, Orzo