Pat the chicken breast dry with a paper towel to ensure a golden-brown, crispy sear.
In a small bowl, combine the sea salt, black pepper, garlic powder, and dried oregano.
Rub the spice blend evenly over both sides of the chicken breast.
Heat 0.5 tbsp of olive oil in a cast-iron skillet or non-stick pan over medium-high heat.
Place the chicken in the hot pan and sear for 6 to 8 minutes per side until the exterior is golden and the internal temperature reaches 165°F.
While the chicken cooks, chop the cucumber into half-moons and halve the cherry tomatoes.
In a large salad bowl, whisk together the remaining 0.5 tbsp of olive oil and the lemon juice to create a light vinaigrette.
Add the mixed greens, cucumber, and cherry tomatoes to the bowl and toss thoroughly to coat every leaf.
Remove the chicken from the pan and let it rest for 3 minutes before slicing it into thin strips.
Arrange the sliced chicken over the salad and sprinkle with hemp hearts for an extra boost of plant-based protein and texture.