Description

There’s something undeniably magical about the combination of caramelized onions, melty cheese, and buttery toasted bread.

Ingredients

Scale

1 large onion, thinly sliced
2 tbsp butter, divided
1 tbsp olive oil
1 tsp sugar
½ tsp salt
2 tsp balsamic vinegar (optional)
4 slices of thick-cut bread (sourdough or French bread works best)
1½ cups shredded Gruyère or Swiss cheese
2 tbsp mayonnaise or softened butter for spreading

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Instructions

Step 1: Caramelize the Onions
Heat 1 tbsp butter and olive oil in a skillet over medium heat. Add the sliced onions, salt, and sugar. Cook, stirring occasionally, for 20-25 minutes until the onions are golden and caramelized. Add balsamic vinegar for extra depth of flavor, then set aside.

Step 2: Assemble the Sandwich
Spread mayonnaise or softened butter on one side of each bread slice. On the unbuttered side of two slices, layer a generous amount of shredded Gruyère and caramelized onions. Top with the remaining bread, buttered side facing out.

Step 3: Grill to Perfection
Heat a skillet or griddle over medium heat. Add the sandwiches and cook for 3-4 minutes on each side, pressing gently, until the bread is golden brown and the cheese is melted.

Step 4: Serve and Enjoy
Slice in half and serve warm. Pair with a side salad or a cup of tomato soup for the ultimate comfort meal.