Season the chicken breast with half of the sea salt and black pepper.
Grill the chicken over medium-high heat for 6 minutes per side until the internal temperature reaches 165 degrees Fahrenheit.
Cut the sourdough bread into small cubes and toss with 1 tsp of olive oil and half of the minced garlic.
Toast the bread cubes in a skillet over medium heat until they are golden brown and crunchy.
Whisk together the Greek yogurt, lemon juice, Dijon mustard, anchovy paste, remaining garlic, and remaining olive oil in a small bowl to create the dressing.
Chop the romaine lettuce and place it in a large mixing bowl.
Slice the grilled chicken into thin strips once it has rested for a few minutes.
Toss the lettuce with the dressing until well coated, then top with the sliced chicken, garlic croutons, and grated parmesan cheese.