01 - In a mixing bowl, whisk together olive oil, lemon juice, minced garlic, salt, and pepper. Add the chicken breasts, turning to coat evenly. Allow to marinate for at least 15 minutes at room temperature.
02 - Preheat a grill or grill pan over medium-high heat until properly heated, approximately 5 minutes.
03 - Lightly brush the cut sides of the peach halves with olive oil to prevent sticking and promote caramelization.
04 - Grill the chicken breasts for 5 to 7 minutes per side until cooked through and juices run clear. Place peach halves cut side down on the grill for 2 to 3 minutes until distinct grill marks form and the fruit softens slightly. Remove everything from the grill and let the chicken rest for 5 minutes before slicing. Cut the grilled peaches into thick wedges.
05 - In a small bowl, whisk together the extra virgin olive oil, honey, fresh lime juice, Dijon mustard, salt, and pepper until the dressing is fully emulsified and smooth.
06 - In a large serving bowl, combine the baby spinach, sliced red onion, torn mint leaves, crumbled feta, and chopped pecans. Arrange the sliced grilled chicken and peach wedges on top. Drizzle with the honey-lime vinaigrette and toss gently to coat all ingredients evenly.
07 - Transfer to plates and serve immediately. Garnish with additional fresh mint leaves if desired.