French Onion Grilled Cheese (with Caramelized Onions)

French onion grilled cheese is the best of both worlds: French onion soup AND grilled cheese. This way, you don’t have to choose one over the other for dinner – it’s like a fancier, grown-up grilled cheese sandwich.

The caramelized onions are cooked low and slow until golden and sweet. Gruyère and Swiss cheese are added, creating a melty, gooey, and rich sandwich with hints of garlic and thyme.

Full recipe in the comments! 🫶

▢ 4 Tablespoons unsalted butter
▢ 1 yellow onion, sliced into half moons
▢ 2 sprigs fresh thyme leaves
▢ 1 clove garlic, minced
▢ ½ teaspoon salt
▢ ¼ teaspoon black pepper
▢ 1 Tablespoon white wine vinegar
▢ 2 ounces Gruyère (about 3 slices)
▢ 2 ounces Swiss cheese (about 3 slices)
▢ 4 slices sourdough bread

Over medium heat, melt 2 tablespoons butter in a large frying pan. Add sliced onion and adjust heat to medium-low. Cook until onion is soft and brown, around 30-45 minutes, stirring every once in a while.
Add thyme, garlic, salt, pepper, and white wine vinegar, and cook for an additional 2 minutes. Transfer onions to a bowl.
Use a paper towel to wipe out skillet. Then, adjust heat to low and add remaining 2 tablespoons of butter to pan. Place two slices of sourdough in pan, and distribute cheese evenly over both slices of sourdough. Add onion mixture and place remaining 2 slices of sourdough on top.
Cook on one side until golden brown, 5-6 minutes, then flip and cook other side for another 3-4 minutes. Remove from pan and cut in half. Serve immediately.

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