Savory French Onion Grilled Cheese Sandwich

Melt 1 tablespoon of butter in a large skillet over medium-low heat. Add the thinly sliced yellow onion and cook, stirring occasionally, for 15-20 minutes, or until deeply caramelized and tender. Stir in the dried thyme, salt, and black pepper during the last 5 minutes of cooking.

While the onions are caramelizing, butter one side of each slice of sourdough bread with the remaining 1 tablespoon of butter.

Lay two slices of bread, butter-side down, in a clean skillet or on a griddle over medium heat.

Divide half of the shredded Gruyère cheese evenly over the unbuttered side of each bread slice in the skillet.

Spoon the caramelized onions over the cheese on both slices.

Top with the remaining shredded Gruyère cheese.

Place the other two slices of bread, butter-side up, on top of the cheese and onions.

Cook for 3-5 minutes per side, or until the bread is golden brown and the cheese is melted and bubbly. Press gently with a spatula to ensure even browning.

Remove from heat, slice in half, and serve immediately.