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french onion chicken casserole

This French Onion Chicken Casserole is a comforting dish that combines tender chicken, rich caramelized onions, and a creamy sauce, all baked with a topping of melted cheese. Perfect for a family dinner, this casserole is both hearty and flavorful.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Course Main Course
Cuisine French-American
Servings 4 People
Calories 450 kcal

Equipment

  • 1 large skillet
  • 1 casserole dish (3-quart)
  • 1 measuring cups and spoons
  • 1 oven

Ingredients
  

  • 2 lbs chicken breast, boneless, skinless
  • 4 large onions, thinly sliced
  • 2 cups beef broth
  • 1 cup sour cream
  • 1 cup shredded Swiss cheese
  • 1 cup shredded mozzarella cheese
  • 3 tablespoons olive oil
  • 2 tablespoons all-purpose flour
  • 1 tablespoon soy sauce
  • 1 teaspoon thyme, dried
  • 1 teaspoon garlic powder
  • to taste salt and pepper
  • 1 cup French bread, cubed for topping

Instructions
 

  • Preheat your oven to 375°F (190°C).
  • In a large skillet, heat the olive oil over medium heat. Add the sliced onions, salt, and pepper. Cook, stirring occasionally, until the onions are caramelized (about 15-20 minutes).
  • While the onions are cooking, season the chicken breasts with salt, pepper, garlic powder, and thyme. In another skillet, cook the chicken over medium heat until browned on both sides (about 6-8 minutes per side). Transfer to a cutting board and let it cool slightly before slicing into bite-sized pieces.
  • In the skillet with the caramelized onions, sprinkle the flour over the onions and stir. Then, add the beef broth and soy sauce. Bring to a simmer and cook for 5 minutes, stirring until the sauce thickens.
  • Remove the skillet from heat and mix in the sour cream and sliced chicken. Combine well and then pour the mixture into a greased casserole dish.
  • Top the casserole with the shredded Swiss and mozzarella cheeses, followed by the cubed French bread for added texture.
  • Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and golden brown.
  • Allow the casserole to cool for a few minutes before serving.

Notes

You can add vegetables like mushrooms or bell peppers for extra nutrition.
This dish pairs well with a side salad or roasted vegetables.
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.