French Onion Chicken Bake – A Cheesy, Comforting Dinner

If you love the deep, savory flavor of French onion soup but crave a heartier meal, this French Onion Chicken Bake will be your new favorite. Juicy chicken breasts are smothered in caramelized onions, baked in a savory sauce, and topped with melty cheese for the ultimate comfort food casserole.

It’s weeknight-friendly, requires simple ingredients, and delivers restaurant-quality flavor in every bite. Pair it with a side of mashed potatoes, roasted veggies, or crusty bread to soak up all that delicious sauce.

🧅 French Onion Chicken Bake Recipe

Ingredients

• 4 boneless, skinless chicken breasts

• 2 large onions, thinly sliced

• 2 tbsp butter

• 1 tbsp olive oil

• 1 tsp salt

• ½ tsp black pepper

• 1 tsp thyme (dried or fresh)

• 1 cup beef broth

• 2 tbsp balsamic vinegar (or dry white wine)

• 1 cup shredded Gruyère or mozzarella cheese

• ½ cup shredded Parmesan cheese

• Fresh parsley, chopped (for garnish)

Instructions

1. Caramelize the Onions

   • Heat butter and olive oil in a skillet over medium heat.

   • Add onions, season with salt, pepper, and thyme, and cook slowly until golden brown (about 20 minutes).

2. Deglaze

   • Stir in balsamic vinegar (or wine) and beef broth, scraping up browned bits. Simmer until slightly reduced.

3. Prepare Chicken

   • Preheat oven to 375°F (190°C).

   • Place chicken breasts in a greased baking dish and season with salt and pepper.

4. Assemble the Bake

   • Spoon caramelized onions and sauce over chicken.

   • Sprinkle generously with Gruyère and Parmesan cheeses.

5. Bake

   • Cover loosely with foil and bake 25–30 minutes, until chicken is cooked through (165°F / 74°C).

   • Remove foil for the last 5 minutes to brown the cheese.

6. Serve

   • Garnish with parsley and serve hot with your favorite sides.

Tips for Success

• Caramelize onions low and slow for the best flavor.

• Use Gruyère for authentic French onion flavor, but mozzarella works too.

• For extra richness, sear chicken in a hot skillet before baking.

Variations

• French Onion Pork Chops: Swap chicken for thick-cut pork chops.

• Creamy Version: Stir a splash of heavy cream into the onion sauce before baking.

• Low-Carb: Serve over cauliflower mash instead of potatoes or rice