French Onion Soup Casserole

🧅🧀 French Onion Soup Casserole – Comfort Food at Its Best! 😍

This rich, cheesy casserole has all the flavors of classic French onion soup — caramelized onions, toasted bread, melted cheese — but baked into a warm, bubbly dish you can serve family-style. It’s cozy, simple, and deeply satisfying.


🧅 Ingredients:

  • 4 large yellow onions, thinly sliced
  • 3 tbsp unsalted butter
  • 1 tbsp olive oil
  • 2 cloves garlic, minced
  • 1 tsp sugar (to help caramelize the onions)
  • 1 tsp salt
  • ½ tsp black pepper
  • 1 tbsp Worcestershire sauce
  • 1 tsp fresh thyme (or ½ tsp dried thyme)
  • 4 cups beef broth (or vegetable broth for a lighter version)
  • 1 loaf French bread or baguette, sliced and toasted
  • 2 cups shredded Gruyère cheese (or Swiss cheese)
  • ½ cup shredded mozzarella cheese (optional, for extra gooeyness)

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