Pat the chicken breast dry with paper towels to ensure a crispy sear.
In a small bowl, combine the dried oregano, garlic powder, sea salt, and black pepper.
Season both sides of the chicken breast evenly with the spice mixture.
Heat 0.5 tbsp of olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and cook for 6-7 minutes per side until the internal temperature reaches 165°F and the exterior is golden brown.
While the chicken rests, whisk together the remaining 0.25 tbsp olive oil and lemon juice in a large bowl.
Add the mixed baby greens, cherry tomatoes, and cucumber to the bowl and toss gently to coat with the dressing.
Slice the chicken into thin strips.
Top the salad with the sliced chicken, sunflower seeds, and fresh parsley.