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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with slow-caramelized onions and tender chicken baked under a golden, bubbling Gruyère crust. Cheesy orzo bake combines broths and Worcestershire for rich, savory flavor in one oven-safe skillet.
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Prep Time 15 minutes
Cook Time 45 minutes
resting 5 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings
Course: Main Dish
Cuisine: French-American
Calories: 720
Ingredients Equipment Method Notes

Ingredients
  

French onion chicken orzo casserole base
  • 1.5 lb chicken breasts cut into bite-sized pieces
  • 2 yellow onions large, thinly sliced
  • 3 tbsp butter
  • 1 tbsp olive oil
  • 3 garlic cloves minced
  • 1 cup dry orzo pasta
  • 2 cup beef broth
  • 1 cup chicken broth
  • 1 tbsp Worcestershire sauce
  • 1 tsp fresh thyme leaves
  • 0.25 salt and black pepper to taste season as needed
  • 1.5 cup Gruyère cheese, shredded

Equipment

  • 1 cast iron skillet

Method
 

Caramelize the onions
  1. Melt butter with olive oil in a large oven-safe skillet over medium-low heat, then add sliced onions with a pinch of salt and cook 25–30 minutes, stirring occasionally, until deeply caramelized and dark golden.
Preheat and sear the chicken
  1. Preheat oven to 375°F and push onions to the side in the skillet, then add chicken pieces and sear 2–3 minutes per side until golden.
Simmer the orzo mixture
  1. Add garlic, dry orzo, both broths, Worcestershire sauce, and thyme, then stir everything together and bring to a simmer for 2–3 minutes until the orzo is evenly distributed.
Bake with Gruyère topping
  1. Top evenly with shredded Gruyère, then transfer the skillet to the oven and bake uncovered 20–25 minutes until orzo is cooked through and the cheese is golden and bubbling over.
Rest and serve
  1. Let the casserole rest 5 minutes before serving so the cheesy sauce thickens slightly and the orzo sets.

Notes

For the deepest flavor, keep the onions at a steady medium-low heat so they caramelize slowly instead of browning fast. Refrigerate leftovers in an airtight container up to 3 days; reheat in a 350°F oven or microwave until hot. Freezing is not recommended because orzo can turn softer after thawing. For a lighter option, swap 1 cup of Gruyère with reduced-fat Swiss while keeping the bake time the same.