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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with slow-caramelized onions and tender chicken baked until the gruyère melts into a golden, bubbly crust. One-skillet method builds deep savory flavor, then bakes uncovered for a cheesy orzo bake with a comforting casserole texture.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 6 servings
Course: Main Dish
Cuisine: French-American
Calories: 720
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5 lb chicken breasts
  • 2 yellow onions 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
  • salt to taste
  • black pepper to taste
  • 1.5 cup Gruyère cheese shredded

Equipment

  • 1 cast iron skillet
  • 1 sheet pan

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 stir to coat.
  2. Cook onions for 25–30 minutes, stirring occasionally, until deeply caramelized and dark golden.
Sear the chicken and build the casserole
  1. Preheat the oven to 375°F while the onions finish caramelizing.
  2. Push onions to the side in the skillet, add chicken pieces, and sear for 2–3 minutes per side until golden.
  3. Add garlic, orzo, beef broth, chicken broth, Worcestershire sauce, and thyme, then stir everything together and bring to a simmer.
  4. Top the mixture evenly with shredded Gruyère.
  5. Bake the skillet uncovered for 20–25 minutes at 375°F until orzo is cooked and cheese is golden and bubbling.
Rest and serve
  1. Let the casserole rest for 5 minutes before serving so the orzo settles.

Notes

For the best texture, caramelize the onions low and slow—if the skillet is browning too fast, drop the heat slightly. Refrigerate leftovers in an airtight container up to 3–4 days; reheat in the oven at 350°F until warmed through. Freezing is not recommended because orzo and cheese can soften after thawing. If you want a lighter swap, use reduced-fat Gruyère and part-skim cheese to keep a melty top.