Creating Greek Chicken Bowls is a straightforward process when you follow these steps:

1. Prepare the Marinade: In a bowl, whisk together olive oil, lemon juice, minced garlic, oregano, salt, and black pepper.
2. Marinate the Chicken: Add chicken breasts to the marinade, ensuring they are well-coated. Let them marinate for at least 30 minutes in the refrigerator for optimal flavor.
3. Cook the Chicken: Heat a grill pan or skillet over medium-high heat. Remove chicken from marinade and cook for 6-7 minutes on each side or until fully cooked. The internal temperature should reach 165°F (75°C).
4. Prepare the Tzatziki Sauce: In a bowl, mix Greek yogurt, grated cucumber, minced garlic, lemon juice, olive oil, salt, and pepper until well combined. Set aside.
5. Cook the Grains: If not already done, cook rice or quinoa according to package instructions. Fluff with a fork once done.
6. Chop the Vegetables: While the chicken is cooking, chop the cherry tomatoes, cucumber, and red onion.
7. Slice the Chicken: Once cooked, allow the chicken to rest for a few minutes before slicing it into strips.
8. Assemble the Bowls: Start with a base of rice or quinoa, then top with sliced chicken, cherry tomatoes, cucumber, red onion, and crumbled feta cheese.
9. Add Tzatziki: Drizzle tzatziki sauce over the top of each bowl.
10. Garnish: Finish with a sprinkle of fresh parsley for a burst of color and flavor.