Why You’ll Love Keto French Onion Chicken Recipe
This recipe is hearty, cheesy, and packed with deep caramelized onion flavor. It feels comforting and restaurant-worthy, but it’s made in one skillet with simple ingredients. It’s also naturally low in carbs, making it a great option for keto dinners, meal prep, or a satisfying family meal.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
1 ½ pounds boneless, skinless chicken breasts, 4 total
4 tablespoons butter, divided
2 medium onions, thinly sliced
½ cup cooking sherry
3 cloves garlic, minced
1 tablespoon Worcestershire sauce
1 tablespoon fresh thyme leaves or 1 teaspoon dried thyme, plus extra for garnish
1 teaspoon sea salt
½ teaspoon black pepper
1 cup beef or chicken stock
1 cup shredded mozzarella cheese
½ cup shredded gruyere cheese
Directions
Lightly season the chicken breasts with salt and pepper on both sides.
In a large skillet over medium-low heat, add 2 tablespoons of butter, the onions, and the garlic. Cook until the onions are deeply caramelized, about 30 minutes. Remove the onions from the pan and set aside.
Increase the heat to medium-high. Add the remaining 2 tablespoons of butter and sear the chicken on both sides until deep golden brown. Remove the chicken from the pan and set aside. The chicken will not be fully cooked yet.
Deglaze the pan with stock, scraping up any browned bits from the bottom of the skillet. Let the mixture simmer for 3 to 5 minutes.
Reduce the heat to medium-low. Add the cooking sherry, Worcestershire sauce, thyme, salt, and pepper. Simmer for about 6 minutes, or until the sauce reduces by half and thickens slightly.
Add the caramelized onions back to the pan. Nestle the chicken into the sauce and simmer until the chicken is cooked through, about 10 minutes, or until it reaches an internal temperature of 165°F.
Spoon onions and sauce over the chicken. Top with mozzarella and gruyere cheese. Bake at 275°F for 7 to 8 minutes, or until the cheese is melted and bubbly.
Spoon a little onion gravy over the top and garnish with fresh thyme before serving.
Servings and timing
Servings: 4
Prep time: 10 minutes
Cook time: 50 minutes
Total time: 1 hour
Variations
Use chicken thighs instead of chicken breasts for a juicier result.
Swap gruyere for Swiss cheese if preferred.
Use beef stock for a richer French onion flavor, or chicken stock for a lighter taste.
Add mushrooms with the onions for extra savory depth.
For a stronger herb flavor, add a small sprig of rosemary while the sauce simmers.
Storage/Reheating
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat gently in a skillet over low heat with a splash of stock to loosen the sauce. You can also microwave individual portions in short intervals until warmed through.
For best texture, avoid overheating, since chicken breasts can become dry.
FAQs
Can I use chicken thighs instead of chicken breasts?
Yes. Boneless, skinless chicken thighs work well and usually stay very tender.
Is this recipe keto-friendly?
Yes. It is low in carbs and uses keto-friendly ingredients like chicken, butter, cheese, onions, and stock.
Can I skip the cooking sherry?
Yes. You can replace it with extra stock if you prefer.
What cheese can I use instead of gruyere?
Swiss cheese is the best substitute, but provolone also works.
Can I make this ahead of time?
Yes. You can make it ahead and reheat gently before serving.
How do I know when the chicken is done?
The chicken is done when it reaches an internal temperature of 165°F.
Can I use pre-sliced onions?
Yes. Pre-sliced onions save time and work fine in this recipe.
Why do the onions take so long to cook?
Caramelizing onions slowly brings out their natural sweetness and deep flavor.
Can I make this without baking?
Yes. Cover the skillet after adding the cheese and let it melt over low heat.
What should I serve with Keto French Onion Chicken?
Serve it with cauliflower mash, roasted broccoli, green beans, zucchini noodles, or a simple salad.
Conclusion
Keto French Onion Chicken is a flavorful, comforting dinner with tender chicken, rich caramelized onions, savory sauce, and melted cheese. It’s easy enough for a weeknight but satisfying enough for a special meal.
Keto French Onion Chicken
This Keto French Onion Chicken combines juicy pan-seared chicken breasts with rich caramelized onions and a savory sherry-infused sauce, all topped with melted mozzarella and gruyere cheese. It’s a comforting low-carb dinner packed with classic French onion flavor.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour
- Yield: 4 servings
- Category: Main Course
- Method: Pan Fry
- Cuisine: French
- Diet: Low Calorie
Ingredients
- 1 1/2 pounds boneless, skinless chicken breasts (4 total)
- 4 tablespoons butter, divided
- 2 medium onions, thinly sliced
- 1/2 cup cooking sherry
- 3 cloves garlic, minced
- 1 tablespoon Worcestershire sauce
- 1 tablespoon fresh thyme leaves or 1 teaspoon dried thyme, plus extra for garnish
- 1 teaspoon sea salt
- 1/2 teaspoon black pepper
- 1 cup beef or chicken stock
- 1 cup shredded mozzarella cheese
- 1/2 cup shredded gruyere cheese
Instructions
- Lightly season the chicken breasts with salt and pepper on both sides. In a large skillet over medium-low heat, melt 2 tablespoons of butter and add the onions and garlic. Cook until the onions are deeply caramelized, about 30 minutes. Remove the onions from the skillet and set aside.
- Increase the heat to medium-high and add the remaining 2 tablespoons of butter. Sear the chicken on both sides until deep golden brown. Remove the chicken from the skillet and set aside. The chicken will not be fully cooked at this stage.
- Deglaze the skillet with the stock, scraping up any browned bits from the bottom of the pan. Simmer for 3 to 5 minutes.
- Reduce the heat to medium-low and stir in the cooking sherry, Worcestershire sauce, thyme, salt, and pepper. Simmer for about 6 minutes, or until the sauce has reduced by half and thickened slightly.
- Return the caramelized onions to the skillet and nestle the chicken into the sauce. Simmer for about 10 minutes, or until the chicken reaches an internal temperature of 165°F.
- Spoon some onions and sauce over the chicken and top with the mozzarella and gruyere cheeses. Bake at 275°F for 7 to 8 minutes, or until the cheese is melted and bubbly. Garnish with fresh thyme before serving.
Notes
- For extra flavor, use beef stock instead of chicken stock.
- Store leftovers in an airtight container in the refrigerator for up to 3 days.
- Serve with roasted vegetables or cauliflower mash for a complete keto-friendly meal.
- Gruyere cheese can be substituted with Swiss cheese if needed.
Nutrition
- Serving Size: 1 chicken breast with sauce
- Calories: 520 kcal
- Sugar: 5 g
- Sodium: 780 mg
- Fat: 33 g
- Saturated Fat: 18 g
- Unsaturated Fat: 12 g
- Trans Fat: 0.5 g
- Carbohydrates: 8 g
- Fiber: 1 g
- Protein: 45 g
- Cholesterol: 155 mg
