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French Onion Grilled Cheese Recipe

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A savory and indulgent French Onion Grilled Cheese sandwich featuring caramelized onions slowly cooked to golden perfection, layers of melty Provolone and Gruyère cheese, and toasted bread with optional mayonnaise for extra crispiness. This recipe brings the rich flavors of classic French onion soup into a comforting, handheld grilled cheese sandwich.

  • Author: Emma
  • Prep Time: 10 minutes
  • Cook Time: 35 minutes
  • Total Time: 45 minutes
  • Yield: 3 sandwiches
  • Category: Sandwich
  • Method: Stovetop
  • Cuisine: French-inspired

Ingredients

For the Caramelized Onions

  • 2 tablespoons salted butter
  • 1 tablespoon extra virgin olive oil (or salted butter)
  • 2 large white onions, thinly sliced
  • 2 large yellow onions, thinly sliced
  • 2 tablespoons Worcestershire sauce
  • 2 teaspoons spicy brown mustard
  • 1 teaspoon Italian seasoning
  • ½ teaspoon garlic powder
  • 1 teaspoon granulated sugar (optional, for caramelization)
  • ½ teaspoon fresh ground black pepper
  • ½ teaspoon fine sea salt

For the Sandwiches

  • 6 slices bread (French, sourdough, brioche, or preferred type)
  • 3 tablespoons mayonnaise (optional, for spreading on bread)
  • 6 slices Provolone cheese
  • 6 slices Gruyère cheese

Instructions

  1. Prepare the caramelized onions: Heat butter and olive oil in a large skillet over medium heat. Add the thinly sliced onions along with Worcestershire sauce, spicy brown mustard, Italian seasoning, garlic powder, sugar if using, black pepper, and sea salt. Stir to combine all ingredients thoroughly.
  2. Caramelize the onions: Cook the onion mixture over medium heat, stirring occasionally, for about 20 to 25 minutes until the onions turn golden brown and caramelized. Continue cooking until the liquid has evaporated. Once done, remove from heat and set aside.
  3. Prepare the skillet for grilling: Heat a clean skillet over medium heat to get it ready for sandwich grilling.
  4. Assemble the sandwiches: Spread mayonnaise on one side of each slice of bread, if using, to add extra crispiness. Place the bread slices mayonnaise side down in the heated skillet.
  5. Add cheese and onions: Layer the Provolone cheese slices over the bread in the skillet, then add a generous portion of the caramelized onions on top, followed by the Gruyère cheese slices.
  6. Complete the sandwich: Cover the cheese and onion layers with another slice of bread, positioning it so the mayonnaise side is facing outwards.
  7. Grill the sandwich: Cook the sandwich in the skillet until the bread is golden brown and crispy, and the cheese melts fully. This will take approximately 2 to 3 minutes per side. Carefully flip to cook the other side.
  8. Serve: Once grilled to perfection, slice the sandwich in half and serve immediately with your favorite chips or sides.

Notes

  • Using mayonnaise on the outer sides of the bread is optional but adds a lovely extra crispness and flavor.
  • For best caramelization results, be patient and cook onions slowly over medium heat.
  • You can substitute bread types based on preference, such as brioche for sweetness or sourdough for tanginess.
  • Adjust seasoning in the caramelized onions to suit your taste, especially black pepper and salt.
  • This sandwich is perfect for a comforting lunch or casual dinner.

Find it online: https://allcookedup.com/french-onion-grilled-cheese-recipe/