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French Onion Chicken Orzo Casserole

French Onion Chicken Orzo Casserole

This French Onion Chicken Orzo Casserole captures the comforting, savory-sweet flavor of classic French onion soup in a hearty, one-pan meal. Tender shredded chicken and orzo pasta are simmered in a creamy, onion-infused sauce, then finished with a bubbly, golden-brown topping of mozzarella and Parmesan cheese for an elegant yet easy dinner.
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Prep Time 15 minutes
Cook Time 50 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings
Ingredients Equipment Method Notes

Ingredients
  

Ingredients
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 large yellow onions, thinly sliced
  • 1 teaspoon sugar (helps with caramelization)
  • 1/2 teaspoon salt
  • 3 garlic cloves, minced
  • 1 1/2 cups orzo pasta, uncooked
  • 2 cups cooked shredded chicken (a rotisserie chicken is perfect for this)
  • 1/2 teaspoon dried thyme
  • 1/4 teaspoon black pepper
  • 2 cups low-sodium chicken broth
  • 1 cup heavy cream (or half and half for a lighter sauce)
  • 1 1/2 cups shredded mozzarella cheese, divided
  • 1/2 cup grated Parmesan cheese
  • Optional: 1/2 teaspoon Worcestershire sauce or a splash of balsamic glaze for extra depth

Equipment

  • Large oven-safe skillet or Dutch oven

Method
 

Instructions
  1. Caramelize the Onions: In a large, oven-safe skillet or Dutch oven, melt the butter and olive oil together over medium heat. Add your thinly sliced onions, the sugar, and salt. Now comes the patient part. Cook, stirring every few minutes, for about 20-25 minutes. You're looking for a deep, rich, golden-brown color. Don't rush this step; it's where all the flavor is born! In the last minute or two of cooking, stir in the minced garlic until it's fragrant.
  2. Toast the Orzo: Add the dry orzo directly into the skillet with the onions. Stir it around for about 2 minutes. This little step toasts the pasta, giving it a slightly nutty flavor and helping it hold its shape in the sauce.
  3. Combine the Base: Add the shredded chicken, dried thyme, and black pepper to the skillet. If you're using it, add the Worcestershire sauce or balsamic glaze now for an extra layer of savory flavor. Give everything a good stir to combine.
  4. Simmer the Casserole: Pour in the chicken broth and the heavy cream, stirring to bring it all together. Bring the mixture to a gentle simmer, then reduce the heat to low. Cover the skillet and let it cook for 8-10 minutes. Stir it once or twice to prevent the orzo from sticking. The pasta should be tender and have absorbed most of the liquid.
  5. Make It Cheesy: Turn off the heat. Stir in 1 cup of the shredded mozzarella and all of the Parmesan cheese. Keep stirring until the cheese is completely melted, creating a ridiculously creamy and luscious sauce.
  6. Bake to Perfection: Preheat your oven to 375°F (190°C). Sprinkle the remaining 1/2 cup of mozzarella cheese evenly over the top of the casserole. Transfer the skillet to the preheated oven and bake, uncovered, for 10-15 minutes. You'll know it's ready when the cheese is melted, bubbly, and beautifully golden on top.
  7. Rest and Serve: Carefully remove the skillet from the oven and let it rest for 5-10 minutes. This is crucial as it allows the sauce to set up slightly. Garnish with some fresh parsley or thyme if you like, and serve warm.

Notes

The key to this dish is patiently caramelizing the onions over medium-low heat for 20-25 minutes until they are deep golden brown and jammy. Use a large, heavy-bottomed, oven-safe skillet to go from stovetop to oven seamlessly. For the creamiest sauce, use a quality chicken broth and freshly grated Parmesan cheese, as pre-shredded varieties can make the sauce grainy.