2. Brush the chicken breasts with olive oil and season with salt and black pepper.
3. Grill the chicken breasts for about 6-7 minutes on each side, or until fully cooked.
4. Toast the burger buns on the grill for 1-2 minutes.
5. Assemble the sandwich by placing the grilled chicken on the bottom bun, followed by lettuce, tomato, and cheese (if using). Top with the other half of the bun.