French Onion Grilled Cheese Sandwich

Posted on: October 12, 2022. Updated on: July 11, 2023.

by Carolina Gelen

4.5 / 5. from 40

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I don’t know about you, but one of my favorite comfort foods is a warm ooey gooey melty grilled cheese sandwich. Combine it with the delicious, sweet, and rich flavor of caramelized onions, and you get all the amazing aspects of french onion soup in a sandwich. The savory, nutty, gruyère or comté cheese melted over soft, jammy onions makes the simple sandwich a hearty, filling meal perfect for fall weather. Don’t worry if you don’t have gruyère or comté cheese. I added alternatives below. Enjoy!


French Onion Grilled Cheese Sandwich

4.5 / 5. from 40

Click to vote

Servings: 1 to 2
Prep: 15 minutes
Cook: 1 hour


  • 2 medium onions, sliced
  • 2 slices bread of choice
  • 1 tablespoon butter
  • Extra-virgin olive oil
  • kosher salt
  • About 1/2 cup grated cheese, gruyère or comté are preferable, but you can mix a melting cheese such as mozzarella or gouda, with parmesan, or aged sharp cheddar for rich flavor


  1. Add a couple glugs of olive oil to a sautéing pan over medium heat
  2. Toss in the onions. Stir occasionally for 1 hour, until the onions go from pale and light, to soft, brown, and fragrant. Add a splash of water every now and then, to deglaze the pan. Season with salt and set aside.
  3. Add a tablespoon of butter and a glug of oil to a pan over medium heat. Fry the bread slices for 1 1/2 to 2 minutes, until golden brown. Flip the slices, add the cheese on one side, the caramelized onions on the other side
  4. Sandwich the two slices together. Grill on each side, for 1 1/2 to 2 minutes, until golden brown and crusty on the outside
  5. Carefully add a tiny splash of water to the pan, cover with a lid and steam the sandwich for 2 to 3 minutes, until the cheese melts.
  6. Slice and serve right away.

Carolina Gelen

I speak 5 languages, but my favorite way to communicate is through the universal language of food. I translate food to be more approachable and accessible for the everyday cook. I didn't grow up with a lot, so I’ve always loved thrifting and finding a good sale. That also shapes my approach to cooking: I try to make most of my recipes as affordable as possible, and that is what my SCRAPS newsletter is about. Every two weeks I will send an exclusive recipe to your inbox. Subscribe to get full access to the newsletter and website.

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2 thoughts on "French Onion Grilled Cheese Sandwich"

  1. J. Sinopoli says:

    This looks so simple and absolutely delicious.
    Thank you for sharing…….❤️

  2. Cai Clave says:

    Looks delicious
    I wanna try this for my kids I’m sure they gonna like this ❣️
    Thanks a Lot