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- 2 large onions, thinly sliced: These are the star of the dish. They become sweet and rich when caramelized. - 2 tablespoons butter: This gives the onions a creamy flavor and helps them caramelize. - 1 tablespoon olive oil: Helps prevent the butter from burning and adds extra flavor. - 1 teaspoon brown sugar: This enhances the natural sweetness of the onions during cooking. - 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme): Thyme adds a lovely herb taste that pairs well with onions. - 4 slices of sourdough bread: Sourdough gives a great tangy flavor and crisp texture. - 4 slices of Gruyère cheese (or Swiss cheese): Gruyère melts beautifully and adds a nutty flavor. - 2 slices of sharp cheddar cheese: This adds a kick of flavor and creaminess. - Salt and pepper to taste: These seasonings bring all the flavors together. - 1 tablespoon balsamic vinegar (optional for extra depth): Balsamic adds a tangy sweetness that enhances the onions.

French Onion Grilled Cheese

Upgrade your grilled cheese game with this mouthwatering French Onion Grilled Cheese recipe! Experience the delicious blend of caramelized onions and melted cheese for a delightful meal everyone will love. With simple instructions, tips, and variations to customize your sandwich, you’ll be ready to impress at your next meal. Click to explore the full recipe and create this comforting classic today!
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Ingredients
  

2 large onions, thinly sliced

2 tablespoons butter

1 tablespoon olive oil

1 teaspoon brown sugar

1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)

4 slices of sourdough bread

4 slices of Gruyère cheese (or Swiss cheese)

2 slices of sharp cheddar cheese

Salt and pepper to taste

1 tablespoon balsamic vinegar (optional for extra depth)

Instructions
 

Caramelize the Onions: In a large skillet over medium heat, melt the butter and olive oil together. Add the sliced onions and sprinkle with a pinch of salt. Cook for about 15-20 minutes, stirring occasionally, until they are soft and caramelized. Add the brown sugar and thyme, and sauté for an additional 2-3 minutes until golden brown. If desired, add the balsamic vinegar and stir well. Remove from heat and set aside.

    Assemble the Sandwich: Spread some butter on one side of each slice of sourdough bread. On the unbuttered side of two slices, layer a slice of Gruyère cheese followed by a generous spoonful of the caramelized onions, then add another slice of Gruyère and a slice of sharp cheddar on top. Close the sandwich with the remaining slices of bread, buttered side out.

      Grill the Sandwich: Heat a pan over medium heat. Place the sandwiches in the pan and grill for 4-5 minutes on one side until golden brown. Carefully flip and grill the other side for another 4-5 minutes, or until the cheese is melted and the bread is golden and crispy.

        Slice and Serve: Remove the sandwiches from the pan, let them cool for a minute, then slice them in half.

          Prep Time: 15 minutes | Total Time: 35 minutes | Servings: 2

            - Presentation Tips: Serve the grilled cheese sandwiches with a side of warm tomato soup for dipping and garnish with fresh thyme on the plate for an elegant touch. Enjoy!