Cheesy French Onion Stuffed Chicken Breasts
Juicy seared chicken breasts stuffed with rich caramelized sweet onions, melted Gruyère, and bubbling Swiss cheese in a savory thyme-infused pan gravy.
In a nutshell: This authentic french cheesy french onion stuffed chicken breasts comes together in just 50 mins using simple whole ingredients. The chef's secret is to Caramelizing onions low and slow is key to developing natural sugars without scorching. Perfect for home cooks seeking a dependable, restaurant-quality finish with minimal effort.
All the iconic flavors of French onion soup transformed into an unforgettable high-protein skillet dinner! Thick chicken breasts are stuffed with slow-caramelized sweet Vidalia onions, packed with melted Swiss and Gruyère cheese, seared golden, and finished with a rich beef and thyme pan reduction.
Key Equipment
- Large oven-safe skillet (cast-iron)
- Sharp paring knife
- Wooden toothpicks
- Meat thermometer
Chef's Pro-Tips
- Pro-Tip: Caramelizing onions low and slow is key to developing natural sugars without scorching.
- Pro-Tip: Use Gruyère for traditional earthy French flavor; fontina or provolone work well as tasty substitutes.
- Pro-Tip: Remember to remove toothpicks before plating and serving.
Ingredients
4
servings
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4 large boneless skinless chicken breasts, approx 8 oz each
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2 large yellow or Vidalia onions, thinly sliced into half-moons
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2 tbsp unsalted butter, divided
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2 tbsp olive oil, divided
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1 cup Gruyère cheese, freshly shredded
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½ cup Swiss cheese, shredded or slices
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½ cup beef broth, rich low-sodium broth
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2 tbsp dry white wine, or dry sherry
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1 tsp fresh thyme leaves, plus whole sprigs for garnish
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1 tsp garlic powder
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1 tsp kosher salt, divided
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½ tsp black pepper
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8 toothpicks wooden toothpicks, to secure stuffing
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Step-by-Step Instructions
Slow-Caramelize Onions
Melt 1 tbsp butter with 1 tbsp olive oil in a skillet over medium-low heat. Add sliced onions and 1/4 tsp salt. Cook slowly, stirring frequently, for 20 to 25 minutes until deeply golden brown and caramelized. Stir in white wine and fresh thyme; cook 1 minute until absorbed. Remove onions and set aside.
Cut Pockets & Season Chicken
Using a sharp paring knife, cut a horizontal pocket into the thick side of each chicken breast, cutting almost through to the opposite edge without piercing all the way. Season outside and inside pockets with garlic powder, salt, and black pepper.
Stuff with Onions & Cheese
Stuff each pocket generously with caramelized onions, shredded Gruyère, and Swiss cheese. Secure the opening with 1 or 2 wooden toothpicks.
Sear & Simmer Gravy
Wipe out skillet, heat remaining oil and butter over medium-high heat. Sear stuffed chicken breasts for 4 to 5 minutes until golden brown. Carefully flip, pour beef broth around chicken in the skillet, top with any remaining cheese, and cover with a lid. Reduce heat to medium-low and cook for 8 to 10 minutes until chicken reaches internal temp of 165°F (74°C).
Broil and Serve
Remove lid and broil for 2 minutes until cheese on top is bubbly and golden. Remove toothpicks, spoon pan juices over chicken, garnish with fresh thyme, and serve hot.
Chef Clara's Kitchen Picks
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View on AmazonFrequently Asked Questions
Yes! Caramelize onions up to 3 days in advance and keep refrigerated until ready to assemble.
Creamy mashed potatoes, roasted asparagus, or a crisp French vinaigrette green salad.
Yes! Sear in skillet for 2 minutes per side, then transfer to a 375°F (190°C) oven for 18-20 minutes until done.
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