Marinate the Chicken: In a bowl, mix olive oil, lemon juice, garlic, oregano, cumin, salt, and black pepper. Add the chicken and coat well. Cover and refrigerate for at least 30 minutes.
Prepare the Tzatziki Sauce: Combine Greek yogurt, grated cucumber, garlic, olive oil, lemon juice, dill, and salt. Mix well and refrigerate until serving.
Cook the Chicken: Preheat a grill or pan to 200°C. Cook the marinated chicken for 6–8 minutes per side until golden and cooked through. Let it rest for 5 minutes before slicing.
Assemble the Bowl: In a bowl, add quinoa or rice as the base. Arrange tomatoes, cucumbers, red onion, feta cheese, and olives around the bowl.
Add Chicken & Tzatziki: Slice the grilled chicken and place it on top. Drizzle with tzatziki sauce.
Garnish & Serve: Sprinkle with parsley and sesame seeds. Enjoy!