This creamy French Onion Chicken is a simple yet crave-worthy dinner that’s made in one skillet! Tender chicken breasts are covered in a rich gravy with caramelized onions, then piled with Gruyere and baked to form a perfectly melty, cheesy layer on top.
Melt butter in a large oven-proof skillet over medium heat. Add the onions and cook for about 20-25 minutes, or until onions are golden and beginning to caramelize.
Stir in the cognac and white wine. Bring the mixture to a boil and then reduce to a simmer. Simmer for 2-3 minutes until the alcohol is cooked off and slightly reduced. Stir in flour. Cook for 1 minute.
Slowly whisk in beef broth. Add salt, sugar, pepper and thyme sprigs. Bring to a boil and reduce to a simmer. Simmer for 3-4 minutes until slightly thickened. Then remove from skillet and set aside. Remove thyme sprigs.
Season chicken breasts with salt and pepper.
Heat oil in the now empty skillet over medium-high heat. Once oil is hot, add chicken breasts and cook about 3-4 minutes per side, until golden. Return onions to skillet and sprinkle cheese over the chicken. Bake for 8-10 minutes until chicken is cooked through and cheese is melted.
Spoon some of the onions and gravy over the top of the chicken, garnish with fresh chopped parsley, and serve.
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Notes
Reheating instructions: Reheat in the oven preheated to 350 degrees for 20-30 minutes, or until warmed through.