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French Onion Chicken Orzo Casserole

French Onion Chicken Orzo Casserole

A comforting one-dish bake featuring caramelized onions, tender chicken, and creamy orzo topped with melted cheese.
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Prep Time 15 minutes
Cook Time 40 minutes
Resting Time 5 minutes
Total Time 1 hour
Course Dinner
Cuisine American
Servings 6 servings
Calories 550 kcal

Ingredients
  

Onion Sauce

  • 2 tbsp butter
  • 1 tbsp olive oil
  • 4 large yellow onions thinly sliced
  • 0.5 tsp salt
  • 0.25 tsp black pepper
  • 2 cloves garlic minced
  • 1 tbsp all-purpose flour
  • 4 cups chicken broth low-sodium
  • 1 cup orzo

Chicken & Cheese

  • 1 lb boneless skinless chicken thighs cubed
  • 1 tsp dried thyme
  • 1 cup Gruyère cheese shredded
  • 0.25 cup Parmesan cheese grated

Instructions
 

Onion Sauce

  • Melt butter and olive oil in a large skillet over medium heat. Add sliced onions, salt, and pepper. Cook, stirring every 5 minutes, until onions are deep golden and sticky, about 25–30 minutes.
    2 tbsp butter, 1 tbsp olive oil, 4 large yellow onions, 0.5 tsp salt, 0.25 tsp black pepper
  • Stir in minced garlic and cook until fragrant, about 1 minute. Sprinkle flour over the onions and cook 1 minute more to remove the raw flour taste.
    2 cloves garlic, 1 tbsp all-purpose flour
  • Pour in chicken broth and bring to a gentle simmer. Stir in orzo and cook 8–10 minutes until orzo is al dente and sauce has thickened around the pasta.
    4 cups chicken broth, 1 cup orzo

Assembly

  • Meanwhile, season cubed chicken thighs with thyme, salt, and pepper. In a separate skillet, sear chicken over medium-high heat until no longer pink, about 5 minutes.
    1 lb boneless skinless chicken thighs
  • Stir cooked chicken into the orzo mixture, transfer to a greased 9×13-inch baking dish. Top evenly with Gruyère and Parmesan. Bake uncovered at 375°F for 15 minutes until cheese is bubbling and golden.
    1 tsp dried thyme, 1 cup Gruyère cheese
  • Let rest for 5 minutes before serving.

Notes

Allow to rest 5 minutes so the casserole sets, making it easier to serve.
Store leftovers in airtight containers and reheat at 350°F until warmed through.

Nutrition

Serving: 300gCalories: 550kcalCarbohydrates: 40g
Keyword Chicken Casserole, French Onion, French Onion Chicken Orzo Casserole, One Dish, Orzo
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