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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with slow-cooked caramelized onions, tender chicken, and creamy orzo baked until the Gruyère is golden and bubbly. A one-pan comfort food casserole with a rich French-style flavor and stretchy, melted cheese on top.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 6 servings
Cuisine: French-American
Calories: 620
Ingredients Equipment Method Notes

Ingredients
  

Chicken and onions base
  • 1.5 lb chicken breasts Cut into bite-sized pieces.
  • 2 yellow onions Thinly sliced.
  • 3 tbsp butter
  • 1 tbsp olive oil
  • 3 garlic cloves Minced.
Orzo casserole liquids and seasonings
  • 1 cup dry orzo pasta
  • 2 cup beef broth
  • 1 cup chicken broth
  • 1 tbsp Worcestershire sauce
  • 1 tsp fresh thyme leaves
  • Salt and black pepper to taste Season throughout to your preference.
Cheesy topping
  • 1.5 cups 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. Cook for 25–30 minutes, stirring occasionally, until deeply caramelized and dark golden.
Cook the chicken and orzo
  1. Preheat oven to 375°F. Push onions to the side, add chicken pieces, and sear for 2–3 minutes per side until golden.
  2. Add garlic, dry orzo pasta, beef broth, chicken broth, Worcestershire sauce, and fresh thyme leaves, then stir everything together and bring to a simmer. Cook until bubbling evenly across the skillet.
Bake and finish
  1. Top evenly with shredded Gruyère cheese, then transfer the skillet to the oven and bake uncovered for 20–25 minutes at 375°F. Bake until the orzo is cooked and the cheese is golden and visibly bubbling.
  2. Let rest for 5 minutes before serving, so the casserole thickens slightly. You should see a calmer, set cheese top after resting.

Notes

Pro tip: caramelize the onions slowly—deep color and sweetness are what drive the flavor. Refrigerate leftovers in an airtight container up to 4 days; reheat in a 350°F oven or microwave until hot and bubbly. Freezing is not recommended because orzo can soften further after thawing. Dietary swap: use gluten-free orzo to make this casserole gluten-free while keeping the same bake time.