Creating Greek Chicken Bowls is straightforward if you follow these simple steps:

1. Marinate the Chicken: In a bowl, mix olive oil, lemon juice, minced garlic, dried oregano, salt, and black pepper. Add the chicken breasts, ensuring they are well coated. Cover and refrigerate for at least 30 minutes.

2. Cook the Chicken: Preheat a grill or skillet over medium-high heat. Remove chicken from the marinade and grill for about 6-7 minutes on each side, or until cooked through and juices run clear. Remove from heat and let it rest for 5 minutes before slicing.

3. Prepare the Base: While the chicken cooks, cook quinoa or brown rice according to package instructions. This will be the base of your bowls.

4. Chop Vegetables: Dice the cucumber, halve the cherry tomatoes, and slice the red onion. Set aside.

5. Assemble the Bowls: In a large bowl, start with a base of quinoa or rice. Top with sliced chicken, cucumbers, tomatoes, and red onions.

6. Add Cheese and Garnish: Sprinkle crumbled feta cheese on top, and garnish with freshly chopped parsley.

7. Serve with Tzatziki: Serve the Greek Chicken Bowls with a generous dollop of tzatziki sauce on the side.

8. Enjoy: Mix everything together and enjoy the burst of Mediterranean flavors!