Creating Herbed Chicken Couscous Bowls with Tzatziki is simple if you follow these steps:

1. Prepare the Couscous: In a medium saucepan, bring the chicken broth or water to a boil. Add the couscous, cover, and remove from heat. Let it sit for about 5 minutes, then fluff with a fork.

2. Marinate the Chicken: In a bowl, mix the olive oil, dried oregano, garlic powder, onion powder, salt, and black pepper. Add the chicken breasts and coat them well in the marinade. Let sit for at least 10 minutes.

3. Cook the Chicken: Heat a grill pan or skillet over medium-high heat. Cook the marinated chicken for about 6-7 minutes on each side, or until fully cooked and no longer pink in the center. Remove from heat and let it rest for a few minutes before slicing.

4. Prepare the Tzatziki Sauce: In a bowl, combine Greek yogurt, minced garlic, fresh dill, lemon juice, grated cucumber, and salt and pepper. Mix well and adjust seasoning to taste.

5. Assemble the Bowls: In each bowl, add a serving of couscous. Top with sliced chicken, cherry tomatoes, cucumber, red onion, and feta cheese if using.

6. Add Tzatziki: Drizzle or dollop the tzatziki sauce over the top of the bowl.

7. Garnish: Finish with a sprinkle of fresh parsley for added freshness and color.