Prepare the Quinoa: In a medium pot, bring water or chicken broth to a boil. Add quinoa and salt, reduce heat, cover, and simmer for 15 minutes until tender. Fluff with a fork and set aside.
Cook the Chicken: Season chicken with salt, pepper, and Italian seasoning. Heat olive oil in a skillet over medium-high heat and cook chicken for 4-6 minutes per side until golden and cooked through. Rest for 5 minutes, then slice.
Assemble the Bowls: Divide quinoa among four bowls. Top with chicken, cherry tomatoes, cucumber, red onion, Kalamata olives, and crumbled feta. Add a dollop of tzatziki and garnish with parsley.
Enjoy your flavorful Greek Chicken Quinoa Bowl!