When the temperatures start to dip, there’s nothing more comforting than a warm bowl of soup accompanied by a grilled cheese sandwich. One of my favourite soups in the cold weather is French Onion because it combines both of those elements in one bowl. Here, we’re flipping that soup on its head and combining a grilled cheese with rich, decadent caramelized onions for the ultimate winter comfort food.

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French Onion Grilled Cheese Sandwich Recipe

Serves: 2

Ingredients:
For the Onions:
2 medium onions, halved and thinly sliced
1 Tbsp unsalted butter
1 Tbsp olive oil
1/2 cup beef or mushroom broth
2 Tbsp balsamic vinegar
2 Tbsp light brown sugar

For the Sandwich:
6 thin slices bread
4 Tbsp salted or unsalted butter
6 slices Swiss cheese

Directions:
Onions:
1. Heat the butter and oil a heavy skillet over medium-low heat.
2. Add the onions and cook for around 15 minutes, until the onions start to turn golden, stirring occasionally.
3. Add the broth, scraping any brown bits off the bottom of the skillet and cook for a couple of minutes until most of the liquid evaporates.
4. Sprinkle sugar and the balsamic vinegar over top, and stir to coat the onions.
5. Continue to cook, stirring occasionally, over low-medium heat for approximately 10 minutes until all the onions are dark and caramelized.
6. Set aside and cool (refrigerate if necessary) until you are ready to use them.

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Sandwich:
1. Pre-heat the broiler to high and line a baking tray with parchment paper.
2. Toast two of the slices of bread (these will be your middle slices) in a toaster.
3. Butter the remaining four pieces of bread.
4. Heat a skillet (preferably one with a ridged base so you’ll get “grill” marks on the bread) over medium-high heat.
5. Place the slices of bread butter-side down (you might have to do this in batches depending on the size of your skillet) and cook until the bread is golden. Remove from the heat.
6. Place all the bread (making sure you know which slices are the top and bottom slices – with the grill marks) on the baking tray and top with one slice of cheese each.
7. Broil until the cheese is bubbling and melted.
8. Spread the caramelized onions on the cheese on each “top” and “bottom” slice of bread.
9. Now construct your sandwich – place the extra slice of bread in between top and bottom slices and close the sandwich.
10. Serve with lots of napkins and maybe a knife and fork!

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Looking for more cheesy goodness? Try Our Cheesiest Recipes Ever.