French Onion Grilled Cheese

This French Onion Grilled Cheese levels up your grilled cheese game with sweet and savory caramelized onions and gooey, melty cheese all tucked between crispy, golden slices of bread. This sandwich is comfort food at its finest – perfect for lunch, dinner or a cozy snack!
Grilled cheese is already a family favorite in our house, but when you add the rich, savory flavor of caramelized onions? It is a whole new level of delicious! This French Onion Grilled Cheese is everything you love about classic French Onion soup, wrapped up in a golden, crispy sandwich.
This decadent and indulgent French Onion Soup Grilled Cheese is quick enough for a busy weekday lunch but feels fancy enough to impress at the dinner table. There is just something magical about the combination of caramelized onions and melty cheese, isn’t there?
Whether you are serving this tasty sandwich for a quick lunch with the kids or a laid-back dinner for the family, it’s sure to be a hit. Plus, I have all the tips to make it easy and foolproof – because let’s face it, who does not love a golden, gooey grilled cheese?
Ingredients:
- 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 helps with the caramelization, optional
- ½ teaspoon fresh ground black pepper
- ½ teaspoon fine sea salt
- 6 slices bread French, sourdough, brioche, etc.
- 3 tablespoons mayonnaise optional, for spreading onto the bread
- 6 slices Provolone cheese
- 6 slices Gruyere cheese
Prep Time:
15 minutes
Cook Time:
30 minutes
Total Time:
45 minutes
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