Creating Healthy Greek Chicken Tzatziki Bowls is an enjoyable process when you follow these simple steps:

1. Marinate the Chicken: In a bowl, whisk together olive oil, red wine vinegar, oregano, garlic powder, onion powder, salt, and pepper. Add the chicken breasts, making sure they are well coated. Let marinate for at least 30 minutes (or up to overnight in the refrigerator).

2. Prepare the Tzatziki Sauce: In a separate bowl, mix Greek yogurt, grated cucumber, minced garlic, dill, lemon juice, salt, and pepper. Set it aside in the refrigerator to allow the flavors to meld.

3. Cook the Chicken: Preheat a grill or skillet over medium-high heat. Remove the chicken from the marinade, letting excess drip off. Cook for about 6-7 minutes on each side or until the internal temperature reaches 165°F (75°C). Remove from heat and let rest for a few minutes before slicing.

4. Assemble the Bowls: In each bowl, place a serving of cooked quinoa or brown rice. Layer with sliced chicken, cherry tomatoes, diced cucumber, red onion, and avocado.

5. Add Tzatziki Sauce: Drizzle generous amounts of tzatziki sauce over the assembled bowls.

6. Garnish: Top with fresh parsley for added flavor and visual appeal.

7. Serve Immediately: These bowls are best enjoyed fresh but can be stored in the refrigerator for meal prep purposes.