In a mixing bowl, whisk together 2 tablespoons of olive oil, the 3 cloves garlic, 2 tbsp fresh lemon juice from about 1 lemon, 1 ½ tsp dried oregano, ½ tsp ground cumin, ¾ tsp salt, and ¼ tsp black pepper. Add the 1 ½ lb boneless skinless chicken thighs trimmed of excess fat and toss to coat thoroughly. Let marinate at room temperature for at least 10 minutes while you prep the other components (or refrigerate up to 4 hours for deeper flavor).

Grate half the whole English cucumber on the large holes of a grater, then squeeze out as much moisture as possible with your hands or a damp kitchen towel. In a mixing bowl, stir together the 1 cup plain Greek yogurt full-fat preferred, grated whole English cucumber, 3 cloves garlic, 2 tbsp fresh lemon juice from about 1 lemon, 1 tbsp fresh dill chopped, and a pinch salt. Taste and adjust seasoning. Refrigerate until ready to serve.

In a large mixing bowl, combine the diced whole English cucumber, chopped whole roma tomatoes, sliced whole red onion, and halved ½ cup kalamata olives pitted and halved. Drizzle with 1 tablespoon 3 tbsp olive oil and 1 tablespoon 1 tbsp red wine vinegar, season lightly with ¾ tsp salt and ¼ tsp black pepper, and toss to combine. Sprinkle the crumbled ¾ cup feta cheese on top. Set aside.

Heat the remaining 1 tablespoon of olive oil in a large skillet over medium-high heat until shimmering. Add the marinated 1 ½ lb boneless skinless chicken thighs trimmed of excess fat in a single layer and cook undisturbed for 5–6 minutes until deeply golden on the bottom. Flip and cook another 4–5 minutes until cooked through (internal temperature of 165°F). Transfer to a cutting board, rest for 3 minutes, then slice or chop into bite-sized pieces.

Divide the cooked 2 cups long-grain white rice cooked according to package directions evenly among 4 bowls. Top each with a portion of sliced boneless skinless chicken thighs trimmed of excess fat and a generous scoop of the Greek salad. Drizzle with tzatziki and serve immediately with lemon wedges on the side if desired.