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French Onion Chicken Orzo Casserole

A warm, creamy casserole featuring caramelized onions, tender chicken, and orzo pasta, all topped with melted cheese for a comforting meal.
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Prep Time 25 minutes
Cook Time 40 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: American, French
Calories: 550
Ingredients Method Notes

Ingredients
  

For the onion mixture
  • 2 tablespoons unsalted butter For sautéing the onions
  • 1 tablespoon olive oil For sautéing the onions
  • 2 large yellow onions, thinly sliced Main flavor component
  • 1 teaspoon sugar To aid in caramelization
  • 1/2 teaspoon salt For seasoning
  • 3 cloves garlic, minced Added towards the end of caramelization
For the casserole
  • 1 1/2 cups orzo pasta Main carbohydrate component
  • 2 cups cooked shredded chicken Rotisserie chicken works well
  • 1/2 teaspoon dried thyme For flavor
  • 1/4 teaspoon black pepper For seasoning
  • 2 cups low-sodium chicken broth Liquid for cooking the orzo
  • 1 cup heavy cream Or half and half for a lighter option
  • 1 1/2 cups shredded mozzarella cheese For creaminess and topping
  • 1/2 cup grated Parmesan cheese For flavor and creaminess
  • 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. 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.
Add Orzo and Chicken
  1. Stir in the orzo and cook for 2 minutes, allowing it to lightly toast.
  2. Add shredded chicken, thyme, pepper, and Worcestershire if using. Mix well.
Pour in Liquids
  1. Add the chicken broth and cream.
  2. 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
  1. Stir in 1 cup of mozzarella and the Parmesan cheese. Mix until melted and creamy.
Bake the Casserole
  1. Preheat oven to 375°F (190°C).
  2. Sprinkle the remaining 1/2 cup of mozzarella over the top.
  3. Bake uncovered for 10–15 minutes until bubbly and golden on top.
Serve
  1. Let it rest for 5–10 minutes before serving. Garnish with fresh thyme or parsley if desired.

Notes

Store leftovers in an airtight container in the fridge for up to 4 days. Reheat gently on the stove or in the microwave. Add broth or cream when reheating for smooth texture.