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French Onion Chicken Orzo Casserole

A comforting blend of classic French onion soup flavors and hearty casserole, featuring caramelized onions, tender chicken, and creamy orzo.
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: Comfort Food, French
Calories: 560
Ingredients Method Notes

Ingredients
  

For the Casserole
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 large yellow onions, thinly sliced
  • 1 teaspoon sugar
  • 1/2 teaspoon salt
  • 3 cloves garlic, minced
  • 1 1/2 cups orzo pasta
  • 2 cups cooked shredded chicken rotisserie works well
  • 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 lighter option
  • 1 1/2 cups shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1/2 teaspoon Worcestershire sauce or balsamic glaze (optional for added depth)

Method
 

Caramelize the Onions
  1. In a large oven-safe skillet or Dutch oven, melt the butter and olive oil over medium heat. Add the sliced onions, sugar, and salt.
  2. Cook for 20–25 minutes, stirring occasionally, until the onions are deeply golden and caramelized.
  3. Just before finishing, stir in the minced garlic for the last 1–2 minutes to infuse more flavor.
Add Orzo and Chicken
  1. Stir in the orzo and cook for an additional 2 minutes, allowing it to lightly toast.
  2. Next, add in the shredded chicken, thyme, black pepper, and Worcestershire sauce if using. Mix everything well to combine.
Pour in Liquids
  1. Pour the chicken broth and cream into the skillet. Bring the mixture to a gentle simmer.
  2. Reduce the heat to low, cover it, and let it cook for 8–10 minutes, stirring occasionally, until the orzo is tender and has absorbed the flavors.
Add Cheese
  1. Stir in 1 cup of mozzarella and the Parmesan cheese. Mix everything until the cheeses have melted and created a creamy texture.
Bake the Casserole
  1. Preheat your oven to 375°F (190°C).
  2. Sprinkle the remaining 1/2 cup of mozzarella over the top of the casserole.
  3. Bake uncovered for 10–15 minutes or until it is bubbly and golden on top.
Serve
  1. Once baked, let the casserole rest for 5–10 minutes before serving. You can garnish with fresh thyme or parsley for an extra pop of color and flavor if desired.

Notes

This casserole is best served warm, paired with a crisp green salad or crusty bread. It's perfect for family dinners or potlucks. For a fun twist, serve with sour cream or fresh herbs.