Gather all your ingredients including fresh greens, tomatoes, cucumbers, and chicken breast. Rinse the greens and pat them dry.

In a bowl, whisk together olive oil, lemon juice, garlic powder, salt, and pepper to create a marinade. Coat the chicken breasts and let them marinate for at least 30 minutes.

Preheat your grill to medium-high heat. Grill the chicken for about 6-7 minutes per side or until the internal temperature reaches 165°F.

Let the grilled chicken rest for about 5 minutes before slicing.

Assemble your salad by combining the greens, sliced chicken, tomatoes, cucumber, red onion, and feta cheese. Drizzle with balsamic vinegar and olive oil, then season with salt and pepper.