French Onion Stuffed Chicken Casserole

Oven Baked French Onion Stuffed Chicken Recipe! Succulent boneless chicken breasts stuffed with soft, caramelized onions and glorious melted cheese. A LOW CARB KETO RECIPE.
You will love this STUFFED chicken recipe! Chicken breasts baked in an irresistible French onion sauce makes a perfect weeknight or weekend dinner. Prep Time : 15 mins
Cook Time : 45 mins
Total Time : 1 hr
Servings: 4 people
Calories: 414 kcal


  • 2 tablespoons unsalted butter
  • 4 large onions halved and thinly sliced
  • Pinch of salt and pepper to season
  • 2 teaspoons fresh chopped thyme divided
  • 2 tablespoons white wine, sherry or balsamic vinegar (OPTIONaL)
  • 2 cloves garlic minced
  • 1/2 cup beef broth or stock divided
  • 1 tablespoon olive oil
  • 4 boneless, skinless chicken breasts
  • 2 teaspoons garlic powder
  • 1 teaspoon ground thyme
  • 1 cup shredded gruyere cheese (or mozzarella cheese)
  • 4 tablespoons freshly grated parmesan cheese


  1. Preheat oven to 400°F (200°C). 
  2. Lightly grease a 9x12-inch baking dish. Set aside.
  3. Melt butter in a large skillet over medium-high heat. add onions and season with salt, pepper and half of the fresh chopped thyme. Cook for 5-8 minutes until soft.
  4. Reduce heat to medium and cook, while stirring occasionally, until onions are caramelized and jammy (about 15 minutes). Pour in 1/4 cup of broth if pan gets too dry, and keep stirring until onions are browned. 
  5. ...........................................
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