01 -
Arrange all ingredients on your workspace, ensuring each component is prepared and measured.
02 -
Preheat a nonstick skillet on medium heat until hot.
03 -
Generously butter one side of each bread slice using the softened unsalted butter.
04 -
Place one slice of bread, buttered side down, onto the heated skillet. Evenly distribute the grated Irish cheddar cheese on top. Add caramelized onions or fresh herbs if desired.
05 -
Cover with the second slice of bread, buttered side facing up. Grill for 3 to 4 minutes, pressing lightly with a spatula, until the bottom is deeply golden and cheese begins melting.
06 -
Carefully flip the sandwich and continue to cook for an additional 3 to 4 minutes, applying gentle pressure, until both sides are browned and cheese is fully melted.