French Onion Soup - GreatEasyRecipe

Ingredients

• 4 large yellow onions (thinly sliced)
• 3 tbsp unsalted butter
• 1 tbsp olive oil
• 1 tsp sugar (optional, to enhance caramelization
• ½ tsp salt
• ¼ tsp freshly ground black pepper
• 2 tbsp all-purpose flour (for thickening)
• ½ cup dry white wine (optional, for depth of flavor)
• 6 cups beef broth (or a mix of beef and chicken broth)
• 1 bay leaf
• 5 sprigs fresh thyme (or 1 teaspoon dried thyme)
• 1 baguette (sliced into 1-inch rounds)
• 1 ½ cups Gruyère cheese (grated)
• ¼ cup Parmesan cheese (optional, for extra flavor)