French Onion Grilled Cheese Sandwich

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

by Carolina Gelen

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

4.4 / 5. from 43

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4.4 / 5. from 43

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

Ingredients

  • 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

Instructions

  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

You may have seen my work on TV, Food Network, NYT Cooking, Food52 and more. I make recipes more fun and accessible for home cooks. I immigrated to the US from Transylvania, Romania—where I lived most of my life—in 2021 to pursue my passion for cooking full-time. Here you’ll find a collection of approachable recipes, from weeknight dinners to desserts, you’ll come back to over and over again. Some of my most popular recipes include my chicken paprikash, orange chicken roast with fennel and shallots or butter beans all vodka. Some recipes are inspired by my Romanian-Hungarian upbringing, and most definitely all come with that Transylvanian resourcefulness! I love a good thrift, so make sure to catch my thrift hauls every Sunday on my Instagram!

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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