Preheat oven to 300°F Cut the snack bars lengthwise and place on cookie sheet. Bake in oven for 10-15 minutes or until bars are a little dried out. Set aside to cool.
Mix chocolate chips with oil in microwavable bowl. Microwave for 30 seconds and stir. Continue to microwave at 30 second intervals until chocolate is smooth and creamy (1 1/2 minutes).
A little at a time, add apple juice concentrate to powdered sugar until it forms a spoonable glaze.
Line a cookie sheet with waxed paper. Drizzle chocolate or apple glaze onto mini biscotti or dip the ends into the glazes, allowing the excess to drip off. Place in refrigerator to set, about 10 minutes. Serve at room temperature.