How to Make Caramelized Onion Grilled Cheese Sandwich

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, creating a melty, gooey, and rich sandwich.

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– Unsalted butter – Yellow onion – Fresh thyme – Garlic – Salt and black pepper – White wine vinegar – Gruyère cheese – Swiss cheese  – Sourdough bread

Ingredients

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Step 1. 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 minutes, stirring every once in a while.

Recipe Instructions

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Step 2. Add thyme, garlic, salt, pepper, and white wine vinegar, and cook for an additional 2 minutes. Transfer onions to a bowl.

Recipe Instructions

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Step 3. Using same skillet, adjust heat to low and add remaining 2 tbsp. of butter to pan. Place two slices of sourdough in pan, and distribute cheese evenly over both slices of bread. Add onion mixture and place remaining 2 slices of sourdough on top.

Recipe Instructions

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Step 4. 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.

Recipe Instructions

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Go low and slow. When caramelizing onions, be sure to use a low heat setting. You don't want to fry the onions, but instead turn them into silky, soft onions that become slightly sweet.

Recipe Tips

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Avoid pre-grated cheese. Try to avoid pre-grated (shredded) cheese, as it includes additives that prevent it from melting nicely.

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SERVE  AND  ENJOY!

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