In a large mixing bowl, combine Brussels sprouts, cranberries, apple, pecans, blue cheese, and bacon. Toss well to combine and set aside.
In a blender, combine the olive oil, vinegar, syrup, and mustard. Blend well to create a dressing. Drizzle the finished dressing over the Brussels sprout mixture and toss to coat all ingredients in the dressing. Let sit for 10 minutes and refrigerate before serving. Enjoy!