In a mixing bowl, combine olive oil, garlic powder, paprika, salt, black pepper, and lemon juice. 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.

Remove from grill and let rest for 5 minutes before slicing.

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

In a small bowl, whisk together olive oil, balsamic vinegar, honey, Dijon mustard, salt, and black pepper to make the vinaigrette.

Drizzle the vinaigrette over the salad and toss to combine.

Slice the grilled chicken and place it on top of the salad. Serve immediately.