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French Onion Chicken Orzo Casserole

A comforting one-dish casserole featuring rich flavors from caramelized onions, tender chicken, and cheesy goodness, making it perfect for family dinners.
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings: 6 servings
Course: Casserole, Main Course
Cuisine: American
Calories: 550
Ingredients Method Notes

Ingredients
  

For the Casserole
  • 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
  • 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 optional; for added depth

Method
 

Preparation
  1. In a large oven-safe skillet or Dutch oven, melt the butter and olive oil over medium heat.
  2. Add the sliced onions, sugar, and salt. Cook for 20–25 minutes, stirring occasionally, until the onions are deeply golden and caramelized.
  3. Stir in the minced garlic during the last 1–2 minutes.
  4. Stir in the orzo and cook for 2 minutes to allow it to lightly toast.
  5. Add the shredded chicken, thyme, pepper, and Worcestershire sauce if using. Mix well.
  6. Add the chicken broth and cream. Bring to a gentle simmer.
  7. Reduce heat to low, cover, and let it cook for 8–10 minutes, stirring occasionally, until the orzo is tender.
  8. Stir in 1 cup of mozzarella and the Parmesan cheese. Mix until melted and creamy.
  9. Preheat the oven to 375°F (190°C).
  10. Sprinkle the remaining 1/2 cup of mozzarella over the top. Bake uncovered for 10–15 minutes until bubbly and golden on top.
  11. Let it rest for 5–10 minutes before serving.

Notes

Serve warm, paired with a green salad or crusty bread. For storage, let cool, then refrigerate for up to 3-4 days or freeze for up to 2 months. Reheat thoroughly before serving.