Wash the romaine and cherry tomatoes thoroughly, then cut them into bite-sized pieces.
Boil the chicken breast and shred it along the grain.
Toast bread pieces (croutons) in olive oil until crispy.
Mix Greek yogurt with lemon juice, minced garlic, Dijon mustard, salt, and pepper to make the dressing.
Combine romaine, cherry tomatoes, chicken breast, and croutons in a bowl and toss with the dressing.
Sprinkle grated parmesan cheese on top to finish.