Caramelized Onion & Gruyère Grilled Cheese (Printable)

Gourmet grilled cheese with sweet caramelized onions, nutty Gruyère cheese, and crispy golden country bread. French-inspired comfort food.

# What You Need:

→ Caramelized Onions

01 - 2 large yellow onions, thinly sliced
02 - 2 tablespoons unsalted butter
03 - 1 tablespoon olive oil
04 - 1/2 teaspoon salt
05 - 1/4 teaspoon freshly ground black pepper
06 - 1 teaspoon fresh thyme leaves
07 - 1 teaspoon balsamic vinegar

→ Sandwiches

08 - 4 slices rustic country bread
09 - 4 ounces Gruyère cheese, grated
10 - 1 tablespoon unsalted butter, softened

# How-To Steps:

01 - In a large skillet over medium-low heat, melt butter with olive oil. Add sliced onions, salt, and pepper. Cook, stirring occasionally, until deeply golden and caramelized, approximately 25 to 30 minutes. Stir in thyme and balsamic vinegar, then cook 1 minute longer. Remove from heat.
02 - Lay out bread slices. Evenly distribute caramelized onions on two slices. Top each with half of the grated Gruyère cheese. Place remaining bread slices on top to close sandwiches.
03 - Spread softened butter evenly on the outside of each sandwich.
04 - Heat a non-stick skillet or griddle over medium heat. Place sandwiches in the pan and cook until golden brown and cheese is melted, approximately 3 to 4 minutes per side. Press gently with a spatula to ensure even toasting.
05 - Slice sandwiches in half and serve immediately.

# Expert Advice:

01 -
  • Sweet, deeply caramelized onions offer a rich contrast to savory cheese.
  • Gruyère provides a professional, nutty melt.
  • Rustic country bread delivers the perfect golden crunch.
  • A simple yet indulgent vegetarian main dish.
02 -
  • Apply a thin layer of Dijon mustard for a zesty kick.
  • Use room temperature softened butter for the most even crust.
  • Always use rustic, thick-cut bread to support the heavy fillings.
Go Back