How to Make It
Preheat grill to high (450°F to 550°F). Whisk together olive oil, lemon juice, honey, salt, and pepper in a medium bowl until combined. Brush peaches evenly with a small amount of the dressing (about 1 teaspoon total). Place peaches, cut side down, on grill grate coated with cooking spray. Grill, uncovered, until grill marks appear and peaches are slightly tender, 2 to 3 minutes on each side. Remove from grill, and set aside.
Combine arugula and mint in a medium bowl. Drizzle with remaining dressing, and toss to coat. Arrange on a platter, and top with peaches, blackberries, sunflower seeds, and cheese.