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Blend the butter with the parsley, Parmesan, garlic and pepper until well combined. Spread the butter mixture evenly over one side of each slice of bread. Place a slice of Cheddar, on the unbuttered side, of 2 slices of bread. Toss the mozzarella with the Gruyere and sprinkle over the Cheddar. Cap the sandwiches with the remaining bread, buttered-side-out.
Select the "Sandwich" program and press "OK". Once the purple indicator light has stopped flashing, place the sandwiches on the grill and close the lid.
Cook until the indicator light has changed to red or until the cheese is melted and the bread is toasted.
Tips: The combination possibilities for this sandwich are endless! Add bacon, ham, salami, turkey, tomato, basil, sage or roasted red peppers. Substitute any combination of favourite cheeses for those suggested in the recipe. Serve this sandwich with a hot bowl of soup for a warming lunch or light supper.