Follow these simple steps to create your Mediterranean Chicken Bowl:

1. Marinate the Chicken: In a bowl, combine olive oil, oregano, garlic powder, salt, and black pepper. Add the chicken breasts and coat them well. Let them marinate for at least 15 minutes.

2. Cook the Quinoa or Rice: While the chicken is marinating, prepare the quinoa or brown rice according to package instructions. Set aside.

3. Cook the Chicken: Heat a skillet over medium heat. Add the marinated chicken breasts and cook for about 6-7 minutes on each side, or until fully cooked and golden brown. Remove from the skillet and let them rest for a few minutes.

4. Slice the Chicken: Once rested, slice the chicken into strips.

5. Prepare the Vegetables: In a large bowl, combine the cherry tomatoes, cucumber, red onion, and Kalamata olives. Toss gently to mix.

6. Assemble the Bowls: In serving bowls, start with a base of quinoa or brown rice. Top with the sliced chicken and the vegetable mixture.

7. Add Feta and Parsley: Sprinkle crumbled feta cheese and chopped parsley on top of each bowl for extra flavor.

8. Serve with Lemon: Serve the bowls with lemon wedges on the side for a fresh splash of acidity.