2. Drizzle the olive oil over each roll or slice of bread. Brush in.
3. Divide the prosciutto among the sandwiches. Top with the spring mix, tomato sprinkled with salt and pepper, a basil leaf and two slices of mozzarella cheese. Repeat with remaining sandwiches.
4. Place sandwiches on the panini press and cook for 5-7 minutes or until the mozzarella is slightly melted and the bread is lightly golden. Serve immediately.