To prepare the dressing:
In a jar with a tight fitting lid, combine the olive oil, vinegar, honey, and mustard. Season with salt and pepper. Shake vigorously to mix well.
Put the chicory in a large salad bowl. Drizzle the dressing over the greens and toss gently with your hands to coat the leaves. Top with hazelnuts, blueberries, and cheese. Serve immediately.