In a bowl, combine olive oil, lemon juice, minced garlic, oregano, salt, and pepper. Add chicken chunks and marinate for at least 30 minutes.
Preheat a grill or grill pan over medium-high heat. Cook chicken for 4-5 minutes per side, until charred and cooked through.
In a separate bowl, mix Greek yogurt, grated cucumber, dill, salt, and a splash of lemon juice for the tzatziki sauce.
Assemble bowls with cooked rice, grilled chicken, sliced cucumber, and cherry tomatoes. Drizzle with tzatziki sauce.
Listen for the sizzle as chicken hits the grill, indicating proper searing for flavor development.
Notice the golden-brown crust forming on the chicken, a sign it's ready to flip.
Smell the fragrant aroma of garlic and oregano as the chicken cooks, infusing it with flavor.
Serve immediately, ensuring the contrast between warm chicken and cool tzatziki is maintained.