Season the chicken breast evenly with the sea salt and black pepper.
Heat a non-stick skillet over medium-high heat and cook the chicken for 6 to 7 minutes per side until the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 5 minutes before slicing it into thin strips.
In a small glass jar, whisk together the extra virgin olive oil, fresh lemon juice, Dijon mustard, minced parsley, and minced chives until emulsified.
Thinly slice the cucumber and radishes, and halve the cherry tomatoes.
In a large mixing bowl, combine the mixed baby greens, cucumber, tomatoes, and radishes.
Toss the salad with half of the lemon-herb vinaigrette until the leaves are lightly coated.
Transfer the greens to a serving plate, top with the sliced chicken, sprinkle with hemp hearts, and drizzle the remaining dressing over the top.