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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with deeply caramelized onions, creamy orzo, and a golden Gruyère cheese crust baked until bubbly. Diced chicken is simmered right in the skillet, then finished in the oven for a hearty French-American main dish.
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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
  

diced chicken breast
  • 1.5 lb chicken breast
thinly sliced onions
  • 2 onions Thinly sliced.
minced garlic
  • 4 garlic Cloves.
uncooked orzo pasta
  • 1.5 cup orzo pasta
beef broth
  • 3 cup beef broth
dry white wine
  • 1 cup dry white wine
cubed cream cheese
  • 8 oz cream cheese Cubed.
dried thyme
  • 1 tsp dried thyme
Worcestershire sauce
  • 1 tbsp Worcestershire sauce
unsalted butter
  • 3 tbsp unsalted butter
shredded Gruyere cheese
  • 2 cup Gruyere cheese Shredded.
fresh thyme garnish
  • 1 fresh thyme For garnish.
salt and pepper
  • 1 salt and pepper To taste.

Equipment

  • 1 cast iron skillet

Method
 

Prep and caramelize the onions
  1. Preheat the oven to 375°F. Set out a large oven-safe skillet so you can go from stovetop to bake.
  2. Melt the butter in the skillet over medium heat, then add the thinly sliced onions. Cook for 30–35 minutes until deeply caramelized, stirring occasionally so the onions turn golden-brown and jammy.
Build the chicken-orzo base
  1. Add the minced garlic and dried thyme to the caramelized onions and cook for 2 minutes. Stir until fragrant, keeping the garlic from browning too fast.
  2. Pour in the dry white wine and cook for 2 more minutes. Let the wine reduce slightly so the skillet smells fragrant and less sharp.
  3. Add the beef broth, Worcestershire sauce, and uncooked orzo, then stir in the diced chicken breast. Make sure the orzo is submerged for even cooking.
  4. Bring the mixture to a simmer, then stir in the cubed cream cheese until melted. The sauce should turn creamy and glossy around the orzo.
  5. Season with salt and pepper to taste, then scatter the shredded Gruyère over the top. You should see cheese forming an even layer with some onion filling peeking through at the edges.
Bake
  1. Bake for 25–30 minutes until the orzo is cooked, the chicken is done, and the cheese is golden. Look for bubbling around the edges and a browned Gruyère top.
  2. Let the casserole rest for 5 minutes, then garnish with fresh thyme before serving. This helps the filling thicken so each scoop holds together.

Notes

Caramelize the onions patiently—low and steady browning gives the classic French onion flavor. Store leftovers in an airtight container in the refrigerator for up to 3 days; reheat covered in the oven at 325°F until hot, adding a splash of broth if needed. Freezing is not recommended because the orzo and cream cheese can change texture after thawing. For a lighter option, use reduced-fat cream cheese and swap part-skim Gruyère.