Season the chicken breast evenly with half of the sea salt, black pepper, and dried oregano.
Heat a skillet over medium-high heat with a small drizzle of the olive oil and sear the chicken for 6 to 7 minutes per side until golden and cooked through.
While the chicken cooks, remove the tough stems from the kale and thinly slice the leaves into ribbons.
In a large mixing bowl, whisk together the lemon juice, lemon zest, minced garlic, remaining olive oil, salt, and pepper.
Add the kale to the bowl and massage the dressing into the leaves with your hands for about 2 minutes until the kale is softened and dark green.
Halve the cherry tomatoes and dice the cucumber, then toss them into the massaged kale mixture.
Slice the cooked chicken into thin strips and place them on top of the salad.
Garnish the dish with hemp hearts for added texture and serve immediately.