Boil the chicken breast and shred it into bite-sized pieces.
Wash the romaine lettuce thoroughly and remove excess water.
Cut the cherry tomatoes in half.
Slice the boiled eggs for easy eating.
Place romaine, chicken breast, cherry tomatoes, and eggs in a bowl.
Mix yogurt, lemon juice, mustard, and salt to make the dressing.
Pour the dressing over the salad and sprinkle a little Parmesan cheese on top.