In a mixing bowl, combine olive oil, lemon juice, oregano, garlic powder, salt, and black pepper. Add chicken breasts and marinate for at least 30 minutes.

Preheat the grill to medium-high heat. Grill the chicken for 6-7 minutes on each side or until fully cooked.

In a large salad bowl, combine mixed greens, cherry tomatoes, cucumber, red onion, and feta cheese.

Drizzle with balsamic vinaigrette and toss gently to combine.

In a bowl, mix the berries with honey and let sit for 10 minutes to macerate.

Serve the berries topped with whipped cream.