In a bowl, toss chicken with olive oil, garlic powder, onion powder, oregano, salt, and pepper.
Cook chicken in a skillet over medium heat for 6-8 minutes until browned and cooked through.
Assemble bowls with a base of rice, topped with cooked chicken, tomatoes, cucumber, red onion, feta, tzatziki, and hummus if using.
Garnish with chopped parsley and serve immediately.