Whisk together syrup, vinegar, mustard, thyme, garlic, salt and pepper in a medium microwave-safe bowl until well blended. Gradually whisk in oil, stirring until thickened.
Combine spinach, apple, cheese and bacon in a large bowl. Just before serving, microwave vinaigrette on HIGH for 30-45 seconds or until warm. Drizzle salad with desired amount of vinaigrette; toss salad and serve immediately.