Ingredients:

  • 2 slices Sourdough bread (thick-cut), about 1 inch thick
  • 2 tablespoons Unsalted butter, softened (30 ml)
  • 1/4 cup Gruyere cheese, shredded (25 g)
  • 1/4 cup Sharp Cheddar cheese, shredded (25 g)
  • 2 tablespoons Caramelized onions (store-bought or homemade) (30 ml)
  • 1 teaspoon Dijon mustard (5 ml) (optional)

Instructions:

  1. Spread one side of each slice of bread evenly with softened butter. Optional: Spread the unbuttered side of one slice with a thin layer of Dijon mustard.
  2. Flip one slice of bread (buttered-side down) into the skillet. Sprinkle half the Gruyere, then all the cheddar, and finally the remaining Gruyere cheese over the bread.
  3. Top with the caramelized onions, spreading evenly.
  4. Place the second slice of bread on top (buttered-side up).
  5. Place the skillet over medium-low heat. Cook for 4-6 minutes per side, or until the bread is golden brown and the cheese is completely melted and gooey. Press gently with the spatula to encourage even melting and browning.
  6. Remove from skillet, let cool slightly, slice (optional), and serve this gourmet cheese sandwich recipe immediately.