Name: French Onion Grilled Cheese
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 2 tablespoons salted butter; 1 tablespoon extra virgin olive oil (or additional 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; 6 slices bread (French, sourdough, brioche, etc.); 3 tablespoons mayonnaise (optional, for spreading); 6 slices Provolone cheese; 6 slices Gruyère cheese

Ingredients

2 tablespoons salted butter
1 tablespoon extra virgin olive oil (or additional 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
6 slices bread (French, sourdough, brioche, etc.)
3 tablespoons mayonnaise (optional, for spreading)
6 slices Provolone cheese
6 slices Gruyère cheese

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Instructions

Heat butter and olive oil in a large skillet over medium heat. Add sliced onions, Worcestershire sauce, mustard, Italian seasoning, garlic powder, sugar (if using), salt, and pepper. Stir to combine.
Cook the onions for 20–25 minutes, stirring occasionally, until caramelized and golden brown. Cook off any excess liquid. Set aside.
Heat a clean skillet over medium heat. Spread mayonnaise on one side of each bread slice if using.
Place one slice of bread in the skillet, mayo side down. Top with 1 slice of Provolone, a generous portion of caramelized onions, and 1 slice of Gruyère. Top with another slice of bread, mayo side up.
Cook for 2–3 minutes per side, or until golden and crispy, and the cheese is melted.
Repeat with remaining ingredients to make 3 sandwiches total.
Slice and serve hot with your favorite side.

Notes

Use a mix of onions for the best sweet-savory caramelized flavor.
Mayo creates a golden crispy crust, but you can substitute butter if preferred.
Add fresh thyme or rosemary to the onions for an herby twist.
Pairs perfectly with tomato soup or a simple green salad.

Author: Maya
Prep Time: 15 minutes
Cook Time: 30 minutes
Category: Sandwich
Method: Pan-Fry
Cuisine: American
Diet: Vegetarian

Nutrition

Serving Size: 1 sandwich
Calories: 822
Sugar: 11g
Sodium: 1280mg
Fat: 49g
Saturated Fat: 25g
Unsaturated Fat: 22g
Trans Fat: 1g
Carbohydrates: 65g
Fiber: 4g
Protein: 30g
Cholesterol: 125mg