French Onion Grilled Cheese

Makes two sandwiches

Ingredients
  

  • 3 tablespoons unsalted butter, divided
  • One small yellow onion thinly sliced
  • One teaspoon of fresh or dried thyme leaves chopped
  • Kosher salt and freshly ground black pepper
  • 1.5 teaspoon Worcestershire
  • 2-4 slices of sharp Cheddar cheese
  • 2-4 slices Swiss cheese
  • Four 1-inch slices of sourdough bread
  • 1 Tablespoon mayonnaise for each sandwich

Instructions
 

  • Heat 2 tablespoons of butter in a medium skillet over medium heat. Add the onions and sprinkle with the thyme, 1/2 teaspoon salt, and several grinds of pepper. Cook, occasionally stirring, until the onions are browned and tender, about 20 minutes. Turn off the heat and transfer the onions to a bowl adding the teaspoon of Worcestershire sauce, and set aside.
  • Assemble sandwich: cheese/onion/cheese. Spread mayo on the outside of the bread pieces.
  • Add a Tablespoon of butter to the skillet and griddle the sandwich over medium heat until golden brown on the first side, about 5 minutes. Flip and cook until the cheese is melted and the exteriors are crispy, about 5 minutes more.