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- 4 cups yellow onions, thinly sliced - 2 tablespoons butter - 1 tablespoon olive oil - 1 teaspoon sugar - 8 slices of sourdough or whole grain bread - 2 cups Gruyère cheese, shredded - 1 cup sharp cheddar cheese, shredded

Gooey French Onion Grilled Cheese

Discover the ultimate comfort food with this Gooey French Onion Grilled Cheese recipe! Experience the delicious combination of caramelized onions, melty Gruyère, and sharp cheddar sandwiched between crispy bread. Follow our easy step-by-step guide to create a mouthwatering treat that will impress everyone. Perfect for lunch or a cozy dinner, don't miss out on this delightful recipe—click through to learn how to make it today!
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Ingredients
  

4 cups yellow onions, thinly sliced

2 tablespoons butter

1 tablespoon olive oil

1 teaspoon sugar

Salt and black pepper, to taste

1 teaspoon dried thyme

1 cup beef or vegetable broth

1 tablespoon balsamic vinegar

8 slices of sourdough or whole grain bread

2 cups Gruyère cheese, shredded

1 cup sharp cheddar cheese, shredded

2 tablespoons Dijon mustard

Fresh parsley or chives, for garnish (optional)

Instructions
 

Caramelize the Onions: In a large skillet, melt the butter and olive oil over medium heat. Add the sliced onions, sugar, and a pinch of salt. Cook for about 15-20 minutes, stirring frequently, until the onions are soft and golden.

    Add Seasonings: Once the onions are caramelized, stir in the dried thyme, broth, and balsamic vinegar. Cook for another 5-10 minutes until the liquid reduces slightly. Season with additional salt and pepper to taste. Remove from heat and set aside.

      Prepare the Bread: Spread Dijon mustard on one side of each slice of bread. On the uncoated side, layer the shredded Gruyère and cheddar cheeses. Top half of the sandwiches with a generous scoop of caramelized onions, then sprinkle more cheese on top before placing the second slice of bread mustard-side-up.

        Grill the Sandwiches: In a clean skillet, heat about 1 tablespoon of butter over medium heat. Grill the sandwiches for 3-4 minutes on each side, or until golden brown and the cheese is melted. You may need to press down slightly while cooking for even grilling.

          Serve Hot: Once grilled, remove from the skillet and allow to cool for a minute. Cut the sandwiches in half and serve with a sprinkle of fresh parsley or chives for a burst of color.

            Prep Time: 15 minutes | Total Time: 45 minutes | Servings: 4

              - Presentation Tips: Serve the sandwiches with a small bowl of leftover caramelized onions on the side for dipping, enhancing the gooey experience! Pair with a light salad or a side of crunchy chips to complement the grilled cheese.