Classic French Onion Soup

⏱ 15 min prep | 45 min cook | 4 servings | Medium

Ingredients:

• 4 large onions, thinly sliced
• 2 tbsp butter
• 1L beef broth
• 1 cup dry white wine
• 4 baguette slices
• 150g gruyère cheese, grated
• Salt, pepper, fresh thyme