Wash and dry the greens, and place in a large serving bowl. Slice the unpeeled peaches a half-inch thick and place on top of the greens. Scatter the mozzarella over the top.
In a small bowl or jar, combine the balsamic vinegar, honey, Dijon mustard, garlic, salt and pepper and mix well. Add the olive oil and whisk or shake to mix. Pour the dressing over the salad and toss to mix. Serve immediately.