Cozy Comforts: French Onion Grilled Cheese

I am all about comfort food this time of year. Hearty soups? Baked casseroles and decadent desserts? Yes to all of it- as long as it warms me up when I come in from the cold temperatures outside! This recipe, a combination of two of my favorite dishes for the Winter- French onion soup and grilled cheese- is a must-have during the chilliest months of the year. It’s not only filling, but it’s packed with a ton of different and satisfying flavors like melty Gruyère, tangy mustard and sweet, crispy onions.

I could easily eat these sandwiches every day leading up to Spring and well beyond- and they’re just so simple to make!



  • 1 tablespoon extra-virgin olive oil
  • 2 yellow onions, thinly sliced
  • Kosher salt and freshly ground black pepper
  • 4 tablespoons unsalted butter, at room temperate
  • 8 slices sourdough bread
  • 1 tablespoon Dijon mustard, plus more for serving
  • 8 ounces Gruyère cheese, shredded


1. In a large skillet, heat the olive oil over medium-low heat. Add the onions and season with a generous pinch of salt. Cook, stirring frequently, until the onions are deeply caramelized, 30 to 40 minutes. (Keep an eye on the onions and adjust the heat as needed. Add a tablespoon or two of water if they are cooking too fast!) The caramelized onions can be held in the fridge for up to 5 days.

2. To make the sandwiches, butter one side of each slice of bread, then place butter side down on your work surface. On half of the slices, spread a thin layer of mustard and season with pepper. Divide the cheese evenly between the four slices, add the caramelized onions, then close the sandwiches with the remaining bread.

3. In a large skillet over medium-low to medium heat, cook the sandwiches until one side is golden brown, about 5 minutes. Flip, then cook the other side until golden brown, about 3 minutes more. (Depending on the size of your skillet, you may need to do this in batches!) Serve the sandwiches with more mustard for dipping.


This is such an addictive and easy dish to prepare for lunch or dinner in just a few quick steps- and they are sure to win over even the pickiest of eaters. You can serve these with a side of chips or a cup of soup to keep up with the coziness, be it French onion soup or the all-time classic companion- tomato soup.

There’s really no wrong way to serve this one!


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Hi! I'm Ashley. I'm a blogger and a radio personality with a makeup and shoe addiction based out of Boston and the Pioneer Valley. These are my (mis)adventures.

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