Marinate the Chicken:
In a bowl, mix olive oil, lemon juice, garlic powder, oregano, salt, and pepper.
Add chicken and marinate for at least 15 minutes (or overnight for stronger flavor).
Cook the Chicken:
Heat a grill pan or skillet over medium heat.
Add chicken pieces and cook for 8–10 minutes, turning occasionally, until golden and cooked through.
Prepare the Tzatziki:
In a small bowl, combine Greek yogurt, grated cucumber, lemon juice, garlic, dill, and salt. Mix well and refrigerate until ready to use.
Assemble the Bowls:
Divide quinoa among 4 containers. Top with chicken, tomatoes, cucumber, red onion, and feta.
Drizzle with tzatziki sauce or pack separately for meal prep.
Garnish:
Sprinkle with parsley and a squeeze of fresh lemon before serving.