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French Onion Chicken Orzo Casserole

A savory casserole featuring caramelized onions, creamy orzo, and melted cheese, perfect for weeknight dinners or potlucks.
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Prep Time 30 minutes
Cook Time 45 minutes
Total Time 1 hour 15 minutes
Servings: 6 servings
Course: Casserole, Main Course
Cuisine: American
Calories: 550
Ingredients Method Notes

Ingredients
  

For the Onion Mix
  • 2 tablespoons unsalted butter For cooking onions
  • 1 tablespoon olive oil For cooking onions
  • 2 large yellow onions (thinly sliced) Provides sweetness when caramelized
  • 1 teaspoon sugar Helps with caramelization
  • 1/2 teaspoon salt For seasoning onions
  • 3 cloves garlic (minced) For flavoring
For the Casserole
  • 1 1/2 cups orzo pasta Cooks quickly and absorbs flavors
  • 2 cups cooked shredded chicken Rotisserie works well for convenience
  • 1/2 teaspoon dried thyme Herb for seasoning
  • 1/4 teaspoon black pepper For seasoning
  • 2 cups low-sodium chicken broth Base for the sauce
  • 1 cup heavy cream Or half-and-half for a lighter version
  • 1 1/2 cups shredded mozzarella cheese For creaminess and topping
  • 1/2 cup grated Parmesan cheese For flavor and depth
  • 1/2 teaspoon Worcestershire sauce or balsamic glaze (optional) For added depth

Method
 

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

Notes

Serve with a crisp green salad and a light white wine, such as Pinot Grigio. Store leftovers in an airtight container for 3–4 days or freeze for up to 2 months.