Wash fresh greens such as romaine and chicory thoroughly, then cut them into bite-sized pieces.
Cut cherry tomatoes, cucumber, and avocado into bite-sized pieces.
Season chicken breast with salt and pepper, grill it, let it cool, then slice.
Place the prepared greens, cherry tomatoes, cucumber, avocado, and chicken breast into a bowl.
Add a dressing made by mixing olive oil, lemon juice, salt, and pepper, and toss gently.
Finish by sprinkling nuts on top.