Toast the Bread:
Lightly brush the bread slices with olive oil or butter. Toast in a skillet or panini press until golden and crisp.
Assemble the Sandwich:
On one slice of bread, layer mozzarella, tomato slices, and fresh basil leaves.
Season:
Sprinkle with salt and black pepper, then drizzle lightly with balsamic glaze.
Finish:
Top with the second slice of bread and press gently. Slice in half and serve immediately.