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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with deeply caramelized onions and creamy orzo baked until golden with Gruyère. One-skillet caramelization builds rich flavor, then the casserole bakes until the cheese browns over a tender chicken-orzo filling.
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Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 10 minutes
Servings: 6 servings
Course: Main Dish
Cuisine: French-American
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

French onion chicken orzo casserole ingredients
  • 1.5 lb chicken breast Diced.
  • 2 large onions Thinly sliced.
  • 4 clove garlic Minced.
  • 1.5 cup orzo pasta Uncooked.
  • 3 cup beef broth
  • 1 cup dry white wine
  • 8 oz cream cheese Cubed.
  • 1 tsp dried thyme
  • 1 tbsp Worcestershire sauce
  • 3 tbsp unsalted butter
  • 2 cup Gruyere cheese Shredded.
  • 1 Fresh thyme for garnish
  • 0.5 tsp Salt To taste.
  • 0.25 tsp pepper To taste.

Equipment

  • 1 cast iron skillet

Method
 

Prep and caramelize onions
  1. Preheat oven to 375F. Set a rack to the middle position so the casserole bakes evenly.
  2. Melt butter in a large oven-safe skillet over medium heat. Add onions and cook 30-35 minutes, stirring occasionally, until deeply caramelized and dark golden at the edges (visual cue: onions look jammy and brown).
  3. Add garlic and thyme and cook 2 minutes. Stir until fragrant (visual cue: steam and aroma, no raw garlic smell).
Build the chicken-orzo base
  1. Add wine and cook 2 more minutes. Let the liquid reduce slightly so the mixture looks glossy.
  2. Add beef broth, Worcestershire sauce, and uncooked orzo, then stir in diced chicken. Keep everything combined so the orzo is evenly coated.
  3. Bring the mixture to a simmer. Stir constantly and keep bubbling gently for a short moment before moving on.
  4. Stir in cubed cream cheese until melted. The sauce should turn creamy and smooth with no visible chunks (visual cue: thick, velvety texture).
Season, top, and bake
  1. Season with salt and pepper to taste. Distribute evenly so every bite has seasoning.
  2. Scatter shredded Gruyère over the top. Cover the surface so it melts into a golden crust (visual cue: cheese layer fully covers).
  3. Bake 25-30 minutes until orzo is cooked, chicken is done, and cheese is golden. Remove when bubbling around the edges and the top looks browned and blistered.
Finish
  1. Garnish with fresh thyme before serving. Add it right after baking so it stays bright in color.

Notes

Pro tip: caramelize the onions until very dark and jammy—this is where most of the casserole’s deep flavor comes from; if the pan dries out, add a splash of broth while keeping the heat at medium. Store leftovers in the fridge up to 4 days in an airtight container; reheat in the microwave or oven until hot throughout. Freezing is not recommended because the orzo and cream cheese can become grainy after thawing. For a lighter option, use reduced-fat cream cheese and reduce Gruyère to 1 cup (keep topping lightly for browning).