This French Onion Chicken Bake is a comforting, savory dish that layers tender chicken breasts with caramelized onions, melted cheese, and a rich, flavorful sauce. Perfect for a cozy weeknight dinner, it combines the classic French onion soup flavors with the heartiness of a baked chicken casserole, making every bite warm, cheesy, and utterly irresistible.
Servings: 4
Ingredients
Chicken & Topping
- 4 boneless skinless chicken breasts (about 1.5 lbs / 700g)
- 1 tbsp olive oil
- Salt & pepper to taste
- 1 tsp dried thyme
French Onion Sauce
- 2 tbsp unsalted butter
- 2 medium yellow onions thinly sliced
- 3 cloves garlic minced
- 1 tsp sugar to caramelize onions
- 1 tsp balsamic vinegar optional, enhances sweetness
- 1 tbsp all-purpose flour
- 1 ½ cups chicken broth
- 1 tsp Worcestershire sauce
- Salt & pepper to taste
Cheese Layer
- 1 cup shredded Gruyère or Swiss cheese
- ½ cup grated Parmesan cheese
Instructions
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Prep & Sear Chicken
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Preheat oven to 375°F (190°C).
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Season chicken breasts with salt, pepper, and thyme.
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Heat olive oil in a skillet over medium-high heat.
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Sear chicken for 2–3 minutes per side until lightly browned. Remove and set aside.
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Make French Onion Sauce
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In the same skillet, melt butter.
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Add onions and sugar, cook 10–12 minutes until golden and caramelized, stirring occasionally.
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Add garlic and cook 1 minute more.
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Sprinkle flour over onions and stir for 1 minute.
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Gradually pour in chicken broth while stirring to create a smooth sauce.
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Add Worcestershire sauce, and season with salt & pepper. Let simmer 3–4 minutes until slightly thickened.
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Assemble Bake
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Place seared chicken in a baking dish.
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Pour the French onion sauce evenly over the chicken.
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Sprinkle Gruyère and Parmesan on top.
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Bake
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Bake uncovered for 20–25 minutes, until chicken reaches an internal temperature of 165°F (74°C) and cheese is bubbly and golden.
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Serve
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Let rest 5 minutes before serving.
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Garnish with fresh parsley if desired. Serve with mashed potatoes, rice, or roasted vegetables.