Caramelized onions, juicy chicken, creamy orzo, and melty cheese come together in this French Onion Chicken Orzo Casserole that tastes like comfort in a dish. It captures the bold, sweet richness of French onion soup and marries it with a hearty, creamy pasta bake you’ll want to revisit all fall and winter.

This casserole is simple enough for a weeknight but elegant enough for a cozy dinner party. The combination of savory broth, herbs, and browned cheese over soft orzo makes every bite irresistible. And if you love dishes that deliver on both texture and flavor, this one’s a keeper.

What Kind of Chicken Should I Use?

Boneless, skinless chicken thighs are the best choice for this dish. They stay tender and flavorful during the baking process. However, if you prefer leaner meat, chicken breasts work just as well—just be sure not to overcook them when sautéing.

Ingredients for the French Onion Chicken Orzo Casserole

2 tablespoons butter
1 tablespoon olive oil
3 large yellow onions, thinly sliced
1 teaspoon sugar
1 teaspoon salt, divided
1/2 teaspoon black pepper
1 tablespoon balsamic vinegar
1 teaspoon dried thyme
1/2 teaspoon garlic powder
1 lb boneless, skinless chicken thighs or breasts, diced
2 cloves garlic, minced
1 cup orzo pasta
2 1/4 cups chicken broth
1/2 cup heavy cream
1 cup shredded Gruyère cheese
1/2 cup shredded mozzarella cheese
Fresh parsley, chopped (for garnish)

How To Make the French Onion Chicken Orzo Casserole

Step 1: Caramelize the Onions

In a large skillet, melt butter and olive oil over medium heat. Add sliced onions, sugar, and ½ teaspoon salt. Cook, stirring occasionally, for 25-30 minutes until golden brown. Add balsamic vinegar, stir to deglaze, and cook for another 2 minutes.

Step 2: Cook the Chicken

Add the diced chicken to the skillet with thyme, garlic powder, black pepper, and remaining salt. Cook for about 5-7 minutes until browned and nearly cooked through. Stir in minced garlic and cook for 1 minute more.

Step 3: Add Orzo and Liquids

Stir in the dry orzo, chicken broth, and heavy cream. Bring to a low simmer, then reduce heat and cover. Cook for 10-12 minutes, stirring occasionally, until orzo is tender and most of the liquid is absorbed.

Step 4: Add Cheese and Bake

Preheat oven to 375°F. Stir in half the Gruyère and mozzarella. Transfer everything to a greased casserole dish, top with remaining cheese, and bake uncovered for 10-15 minutes until bubbly and golden.

Step 5: Garnish and Serve

Let rest for 5 minutes before serving. Sprinkle with fresh parsley for a burst of color and freshness.

Serving and Storing the Casserole

This dish is best served hot, straight from the oven, with a side salad or crusty bread to soak up the creamy sauce. Leftovers keep well in the fridge for up to 4 days and reheat beautifully in the oven or microwave. You can also freeze individual portions for a quick, comforting meal anytime.

Frequently Asked Questions

Can I use rotisserie chicken?

Absolutely! Skip step 2 and fold in the shredded rotisserie chicken after the onions are caramelized.

Is there a cheese substitute for Gruyère?

Yes, Swiss cheese or fontina can stand in. They both melt well and have a similar nutty flavor.

Can I make this ahead of time?

Yes, assemble the casserole up to the baking step, cover, and refrigerate for up to 24 hours. Bake when ready to serve.

Is orzo gluten-free?

Traditional orzo is made with wheat, but gluten-free options are available at most grocery stores.

What can I serve with this casserole?

Roasted green beans, garlic butter broccoli, or a citrusy arugula salad are all excellent side pairings.

Want More Cozy Chicken Dinner Ideas?

If this French Onion Chicken Orzo Casserole hit the spot, check out these other crave-worthy dinners:

Creamy Garlic Chicken Breasts for a weeknight-friendly richness.
Chicken Cordon Bleu Casserole if you’re feeling indulgent.
One Pan Chicken with Buttered Noodles for fewer dishes but big flavor.
Slow Cooker Creamy Ranch Chicken when you want dinner ready by evening.
Marry Me Chicken Pasta for creamy, dreamy vibes.

📌 Save this recipe to your Pinterest dinner board so you’ll always have a cozy casserole on hand.

Tried it? I’d love to hear how yours turned out! Did you stick with Gruyère or swap in another cheese? Maybe added mushrooms or spinach?

Drop a comment below and let’s keep swapping dinner ideas. And if you want more of my daily dishes, follow along on Pinterest at Nina Dishes.

French Onion Chicken Orzo Casserole

Author: Nina Klatten
Total Time: 1 hour
Yield: 6 servings

Print Recipe

Description

French Onion Chicken Orzo Casserole blends caramelized onions, juicy chicken, and creamy orzo with melted cheese for the ultimate comfort food. It’s rich, cozy, and perfect for both weeknights and gatherings.

Instructions

1. Melt butter and olive oil in a skillet over medium heat. Add onions, sugar, and 1/2 teaspoon salt. Cook for 25-30 minutes until golden. Add balsamic vinegar and stir for 2 more minutes.

2. Add diced chicken, thyme, garlic powder, black pepper, and remaining salt. Cook for 5-7 minutes until browned. Stir in garlic and cook for 1 minute.

3. Add orzo, broth, and cream. Bring to a simmer. Cover and cook for 10-12 minutes until orzo is tender.

4. Preheat oven to 375°F. Stir in half the cheeses. Transfer to a casserole dish. Top with remaining cheese and bake 10-15 minutes until bubbly.

5. Let sit 5 minutes, garnish with parsley, and serve hot.