Preheat the grill to medium-high heat.
In a bowl, mix olive oil, garlic powder, oregano, salt, and pepper. Coat the chicken breasts with this mixture.
Grill the chicken for about 6-7 minutes on each side or until fully cooked (internal temperature should reach 165Β°F). Remove from grill and let rest for a few minutes before slicing.
In a large bowl, combine mixed greens, cherry tomatoes, cucumber, red onion, feta cheese, and olives.
In a small bowl, whisk together lemon juice, red wine vinegar, Dijon mustard, salt, and pepper to make the vinaigrette.
Slice the grilled chicken and add it to the salad. Drizzle with the vinaigrette and toss gently to combine.
Serve immediately.
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