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French Onion Chicken Orzo Casserole topped with melted cheese and herbs

French Onion Chicken Orzo Casserole

This comforting casserole combines the rich flavors of French onion soup with chicken and orzo pasta, perfect for weeknight dinners or gatherings.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: Comfort Food, French
Calories: 560
Ingredients Method Notes

Ingredients
  

For the onion base
  • 1-2 tablespoons unsalted butter Adds richness to the dish.
  • 1 tablespoon olive oil Helps to caramelize the onions beautifully.
  • 2 large yellow onions (thinly sliced) The star ingredient for that French onion flavor.
  • 1 teaspoon sugar Balances the savory with a hint of sweetness.
  • 1/2 teaspoon salt Enhances the taste of the onions.
  • 3 cloves garlic (minced) Adds aromatic depth to the casserole.
For the pasta and chicken
  • 1 1/2 cups orzo pasta A pasta choice that absorbs the flavors wonderfully.
  • 2 cups cooked shredded chicken (rotisserie works well) For an easy protein boost.
  • 1/2 teaspoon dried thyme Imparts an earthy flavor.
  • 1/4 teaspoon black pepper Adds a subtle kick.
  • 2 cups low-sodium chicken broth Keeps the dish moist and flavorful.
  • 1 cup heavy cream (or half and half for lighter option) Creates a creamy texture.
For the cheesy topping
  • 1 1/2 cups shredded mozzarella cheese Melts beautifully for that cheesy top layer.
  • 1/2 cup grated Parmesan cheese Offers a nutty flavor that enriches the casserole.
  • 1/2 teaspoon Worcestershire sauce or balsamic glaze (optional) Elevates the flavor profile.

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.
  3. When the onions are deep golden and caramelized, stir in the minced garlic for the last 1–2 minutes.
  4. Stir in the orzo and let it lightly toast for about 2 minutes.
  5. Add the cooked shredded chicken, thyme, black pepper, and Worcestershire sauce, if desired. Mix well.
  6. Pour in the chicken broth and heavy cream, bringing the mixture to a gentle simmer.
  7. Reduce the heat to low, cover, and cook for 8–10 minutes. Stir occasionally until the orzo is tender.
  8. Once cooked, stir in 1 cup of mozzarella and the Parmesan cheese. Mix thoroughly until melted and creamy.
  9. Preheat your oven to 375°F (190°C).
  10. Sprinkle the remaining 1/2 cup mozzarella cheese on top.
  11. Bake uncovered for 10–15 minutes, or until bubbly and golden on top.
  12. Remove from the oven and let it rest for 5–10 minutes before serving. Garnish with fresh thyme or parsley if desired.

Notes

To ensure perfect results, pay attention to the caramelization of the onions and adjust seasoning as needed. Store leftovers in an airtight container for up to three days.