01 - In a mixing bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, dried thyme, paprika, salt, and black pepper. Add the chicken breasts and turn to 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 toast, stirring constantly, for 1 minute. Pour in the water and salt, bring to a boil, then cover tightly. Reduce heat to low and simmer for 12 to 15 minutes. Remove from heat and let stand covered for 5 minutes before fluffing with a fork.
03 - Grate the half cucumber and squeeze out excess moisture using a clean towel. In a small bowl, combine the Greek yogurt, grated cucumber, fresh dill, minced garlic, olive oil, lemon juice, salt, and pepper. Stir thoroughly, then refrigerate until ready to serve.
04 - Heat a grill pan or skillet over medium-high heat. Remove the chicken from the marinade and grill for 5 to 6 minutes per side, until the internal temperature reaches 165°F. Transfer to a cutting board and rest for 5 minutes before slicing against the grain.
05 - Divide the fluffy rice among four bowls. Arrange sliced grilled chicken, diced cucumber, halved cherry tomatoes, thinly sliced red onion, Kalamata olives, and crumbled feta over each portion. Spoon tzatziki generously on top and finish with fresh parsley or dill and lemon wedges.