In a large mixing bowl, add the spinach, minced garlic cloves, onion slices, diced avocado, dates, and sliced peaches. Drizzle with balsamic vinegar. Gently toss together. Transfer to a serving bowl. Serve immediately or chill in the fridge for 1-2 hours.
Store leftovers in a covered container in the fridge for up to 5 days.