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French Onion Chicken Orzo Casserole

A comforting dish with rich flavors of caramelized onions, tender chicken, and creamy orzo pasta topped with gooey cheese, perfect for family dinners.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: American, Comfort food
Calories: 540
Ingredients Method Notes

Ingredients
  

For the Onion Mixture
  • 2 tablespoons unsalted butter Used for caramelizing onions
  • 1 tablespoon olive oil Used for caramelizing onions
  • 2 large yellow onions (thinly sliced) Main flavor base
  • 1 teaspoon sugar Helps caramelize onions
  • 1/2 teaspoon salt Enhances flavor
  • 3 cloves garlic (minced) Adds flavor
For the Casserole
  • 1 1/2 cups orzo pasta Main carbohydrate component
  • 2 cups cooked shredded chicken Rotisserie chicken works well
  • 1/2 teaspoon dried thyme Adds herb flavor
  • 1/4 teaspoon black pepper Adds mild spice
  • 2 cups low-sodium chicken broth Liquid base for cooking
  • 1 cup heavy cream For creaminess (or use half and half for lighter option)
  • 1 1/2 cups shredded mozzarella cheese For cheesiness
  • 1/2 cup grated Parmesan cheese For flavor and texture
  • 1/2 teaspoon Worcestershire sauce or balsamic glaze Optional for added depth

Method
 

Caramelize the Onions
  1. Melt butter and olive oil in a large oven-safe skillet over medium heat.
  2. Add sliced onions, sugar, and salt. Cook for 20–25 minutes, stirring occasionally, until deeply golden and caramelized.
  3. Stir in minced garlic during the last 1–2 minutes of cooking.
Add Orzo and Chicken
  1. Stir in orzo and cook for 2 minutes to lightly toast.
  2. Add shredded chicken, thyme, pepper, and Worcestershire sauce if using. Mix well.
Pour in Liquids
  1. Add chicken broth and cream. Bring to a gentle simmer.
  2. Reduce heat to low, cover, and cook for 8–10 minutes, stirring occasionally, until orzo is tender.
Add Cheese
  1. Stir in 1 cup of mozzarella and Parmesan cheese until melted and creamy.
Bake the Casserole
  1. Preheat oven to 375°F (190°C).
  2. Sprinkle remaining 1/2 cup of mozzarella over the top and bake uncovered for 10–15 minutes until bubbly and golden.
Serve
  1. Let the casserole rest for 5–10 minutes before serving.
  2. Garnish with fresh thyme or parsley if desired.

Notes

To store leftovers, cool completely and store in an airtight container in the refrigerator for up to 3 days. For freezing, wrap well before baking and it will keep for about 2 months. Thaw overnight in the fridge before baking.