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French Onion Soup Casserole

A rich and comforting French onion casserole with sweet caramelized onions, savory broth, and golden melted cheese over soft bread, baked into one cozy dish that feels homemade, hearty, and perfect for an easy family dinner
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 4 servings
Course: Casserole
Cuisine: French
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Main Ingredients
  • 3 yellow onions thinly sliced
  • 3 tbsp butter
  • 2 cups beef broth
  • 2 cloves garlic minced
  • 1 tsp thyme
  • 3 cups bread cubes slightly dry
  • 1 1/2 cups Gruyere or mozzarella cheese shredded
  • salt and pepper to taste

Equipment

  • Large Pan
  • Baking Dish

Method
 

  1. Preheat oven to 375°F (190°C) and lightly grease a baking dish.
  2. Melt butter in a large pan and cook sliced onions over medium heat for 20–25 minutes until soft and caramelized.
  3. Add garlic, thyme, salt, and pepper. Cook for 2 minutes.
  4. Pour in beef broth and simmer for 5–7 minutes.
  5. Place bread cubes in the baking dish and pour onion mixture over them.
  6. Top with shredded cheese evenly.
  7. Bake for 20–25 minutes until cheese is melted and golden brown.
  8. Let rest for 5 minutes before serving.

Notes

You can prepare the onion mixture ahead of time and refrigerate before baking. Swap cheeses or add mushrooms or chicken for variation.