01 - In a mixing bowl, whisk together olive oil, lemon juice, garlic, oregano, thyme, paprika, salt, and pepper. Add the chicken breasts and coat evenly. Cover and refrigerate for at least 20 minutes, or up to 2 hours for deeper flavor.
02 - Heat olive oil in a saucepan over medium heat. Add the rice and stir for 1 minute to toast the grains. Pour in water and salt, bring to a boil, then cover, reduce heat to low, and simmer for 12 to 15 minutes. Remove from heat and let rest, covered, for 5 minutes. Fluff with a fork.
03 - Combine Greek yogurt, grated and squeezed cucumber, fresh dill, minced garlic, olive oil, lemon juice, salt, and pepper in a bowl. Stir thoroughly until smooth and refrigerate until ready to serve.
04 - Heat a grill pan or skillet over medium-high heat. Remove chicken from the marinade and grill for 5 to 6 minutes per side until fully cooked through and golden. Transfer to a cutting board and rest for 5 minutes before slicing.
05 - Divide the fluffed rice among four bowls. Arrange sliced grilled chicken, diced cucumber, halved cherry tomatoes, red onion, Kalamata olives, and crumbled feta on top. Spoon tzatziki generously over each bowl and finish with fresh herbs and lemon wedges.