Marinate the Chicken: Mix olive oil, lemon juice, oregano, garlic powder, salt, and pepper in a medium bowl. Add chicken breasts, coat well, cover, and refrigerate for at least 30 minutes.
Cook the Rice: In a saucepan, combine basmati rice with chicken broth over high heat until boiling. Reduce heat to low, cover, and simmer for about 15 minutes until liquid is absorbed and rice is tender.
Grill the Chicken: Heat a grill pan over medium-high heat. Remove chicken from marinade, let excess drip off, and grill each side for about 6-7 minutes until fully cooked.
Assemble Your Bowl: Allow grilled chicken to rest for five minutes before slicing. In a serving bowl, layer cooked basmati rice, grilled chicken, cherry tomatoes, cucumber, red onion, olives, and feta cheese.
Garnish & Serve: Top with chopped parsley and serve with lemon wedges for an extra burst of flavor.