Preheat your oven to 400°F (200°C).
Pat the chicken breast dry and season with half of the olive oil, half of the lemon juice, dried oregano, sea salt, and black pepper.
Place the chicken on a parchment-lined baking sheet and roast for 18-22 minutes, or until the internal temperature reaches 165°F.
While the chicken roasts, prepare the white rice according to package instructions if not using pre-cooked rice.
Dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
In a small bowl, toss the cucumber, tomatoes, and onion with the remaining olive oil and lemon juice.
Once the chicken is cooked, let it rest for 5 minutes before slicing into thin strips.
Assemble the bowl by placing the fluffy white rice at the base, followed by the sliced chicken and the fresh vegetable salad.
Top with crumbled feta cheese and an extra sprinkle of oregano if desired.