French Onion Grilled Cheese

What you need

• 1 large yellow onion, thinly sliced
• 1 tablespoon olive oil
• 1/2 teaspoon thyme
• 4 slices sourdough
• 2 tablespoons softened butter
• 3/4 cup shredded Gruyère

The easy way

1. Cook onion in oil with thyme and a pinch of salt over medium-low heat until deeply golden, 20–25 minutes.
2. Divide onion and Gruyère between the bread; butter the outsides.
3. Cook covered over medium-low heat until golden.
4. Flip and finish until the cheese has melted.

Use your senses. Times are guardrails. Look for color, texture, and doneness as you go. Refrigerate perishable leftovers promptly; reheat cooked leftovers to 165°F when applicable.